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The following is an excerpt from a 10-K SEC Filing, filed by APA OPTICS INC /MN/ on 6/29/2004.
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CLEARFIELD, INC. - 10-K - 20040629 - SECURITY_OWNERS

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT.

Certain information required by Item 12 is incorporated in this Report by reference to the proxy statement for annual meeting of shareholders to be held in August 2004.

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-------------------------------------  ------------------------  ----------------------  -------------------------------
                                                 (a)                      (b)                          (c)
-------------------------------------  ------------------------  ----------------------  -------------------------------
Plan category                          Number of securities to      Weighted-average     Number of securities remaining
                                       be issued upon exercise     exercise price of      available for future issuance
                                       of options, warrants or    outstanding options,      under equity compensation
                                                rights            warrants and rights      plans (excluding securities
                                                                                            reflected in column (a))
-------------------------------------  ------------------------  ----------------------  -------------------------------
Equity compensation plans approved by
security holders                                        385,115  $                 3.74                        1,042,628
-------------------------------------  ------------------------  ----------------------  -------------------------------
Equity compensation
plans not approved by
security holders                                        590,822  $                 8.05                  Not applicable*
-------------------------------------  ------------------------  ----------------------  -------------------------------
Total                                                   975,937  $                 6.35                        1,042,628
-------------------------------------  ------------------------  ----------------------  -------------------------------

*  These securities are comprised solely of warrants that were not issued pursuant to any formal plan with an authorized
number  of  securities  available  for  issuance.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS.

Information required by Item 13 is incorporated in this Report by reference to the proxy statement for our annual meeting of shareholders to be held in August 2004.

ITEM 14. PRINCIPAL ACCOUNTANT FEES AND SERVICES

Information required by Item 14 is incorporated in this Report by reference to the proxy statement for our annual meeting of shareholders to be held in August 2004.

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                                     PART IV

ITEM  15.     EXHIBITS,  FINANCIAL STATEMENT SCHEDULES, AND REPORTS ON FORM 8-K.

     (a)     (1)      The following financial statements are filed herewith under Item 8.

                                                                                          Page
                                                                                          ----

            (i)  Report of Independent Registered Public Accounting Firm for. . . . . . .  F1
                 the years ended March 31, 2004, 2003 and
                 2002
           (ii)  Consolidated Balance Sheets as of March 31, 2004 and 2003. . . . . . . .  F2

          (iii)  Consolidated Statements of Operations for the years ended
                 March 31, 2004, 2003 and 2002. . . . . . . . . . . . . . . . . . . . . .  F3
           (iv)  Consolidated Statement of Shareholders' Equity for the years ended
                 March 31, 2004, 2003 and 2002. . . . . . . . . . . . . . . . . . . . . .  F4
            (v)  Consolidated Statements of Cash Flows for the years ended
                 March 31, 2004, 2003 and 2002. . . . . . . . . . . . . . . . . . . . . .  F6
           (vi)  Notes to the Consolidated Financial Statements for the years ended
                 March 31, 2004, 2003 and 2002. . . . . . . . . . . . . . . . . . . . . .  F7

       (2)      Financial Statement Schedules: None

(b) Reports filed on Form 8-K:

In the last quarter of our fiscal year ended March 31, 2004, we filed the following reports on Form 8-K

--------------  --------------  --------------------------  --------------------
Date of Report  Date of Filing  Event Reported              Financial Statements
                                                            Filed
--------------  --------------  --------------------------  --------------------
January 15      January 15      Press release announcing    None
                                organizational changes
--------------  --------------  --------------------------  --------------------

(c) Exhibits. See Exhibit Index.

45

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

APA Optics, Inc.

Date: June 29, 2004                 By  /s/  Anil  K.  Jain
                                        ----------------------------------------
                                        Anil  K.  Jain
                                        President and Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates indicated.

SIGNATURE                    TITLE                                       DATE
---------------------------  ------------------------------------------  -------------

/s/ Anil K. Jain             President, Chief Executive Officer, Chief   June 29, 2004
---------------------------  Financial Officer and Director (principal
Anil K. Jain                 executive officer and principal financial
                             officer)

/s/ Kenneth A. Olsen         Secretary, Vice President, and Director     June 29, 2004
---------------------------
Kenneth A. Olsen

/s/Daniel Herzog             Comptroller (principal accounting officer)  June 29, 2004
---------------------------
Daniel Herzog

/s/ John G. Reddan           Director                                    June 29, 2004
---------------------------
John G. Reddan

/s/ Ronald G. Roth           Director                                    June 29, 2004
---------------------------
Ronald G. Roth

/s/ Stephen A. Zuckerman MD  Director                                    June 29, 2004
---------------------------
Stephen Zuckerman

46

                                          EXHIBIT  INDEX

=======================================================================================================
                                                                       PAGE NUMBER OR INCORPORATED
NUMBER                   DESCRIPTION                                         BY REFERENCE TO
-------------------------------------------------------------------------------------------------------
     2.1  Asset Purchase Agreement between APACN and               Exhibit 2.1 to Form 8-K filed
          CSP, Inc.                                                March 31, 2003

     2.1  Asset Purchase Agreement between APACN and               Exhibit 2.1 to Form 8-K filed July
          Americable, Inc.                                         2, 2003

     2.2  Agreement Not to Compete with Peter Lee as part of       Exhibit 2.2 to Form 8-K filed
          CSP asset purchase                                       March 31, 2003

     3.1  Restated Articles of Incorporation, as amended to date   Exhibit 3.1 to Registrant's Report
                                                                   on Form 10-Q for the quarter
                                                                   ended September 30, 2000

     3.2  Bylaws, as amended and restated to date                  Exhibit 3.2 to Registrant's Report
                                                                   on Form 10-KSB for the fiscal
                                                                   year ended March 31, 1999

  4.1(a)  State of South Dakota Board of Economic                  Exhibit 4.1(a) to the Report on 10-
          Development $300,000 Promissory Note, REDI Loan:         QSB for the quarter ended June
          95-13-A                                                  30, 1996 (the "June 1996 10-
                                                                   QSB")

  4.1(b)  State of South Dakota Board of Economic                  Exhibit 4.1(b) to the June 1996
          Development Security Agreement REDI Loan No: 95-         10-QSB
          13-A dated May 28, 1996

  4.2(a)  700,000 Loan Agreement dated June 24, 1996 by            Exhibit 4.2(a) to the June 1996 10-
          and between Aberdeen Development Corporation and         QSB
          APA Optics, Inc.

  4.2(b)  300,000 Loan Agreement dated June 24, 1996               Exhibit 4.2(b) to the June 1996
          between Aberdeen Development Corporation and             10-QSB
          APA Optics, Inc.

  4.2(c)  250,000 Loan Agreement dated June 24, 1996 by            Exhibit 4.2(c) to the June 1996 10-
          and between Aberdeen Development Corporation and         QSB
          APA Optics, Inc.

  4.2(d)  300,000 Loan Agreement dated June 24, 1996 by            Exhibit 4.2(d) to the June 1996
          and between Aberdeen Development Corporation and         10-QSB
          APA Optics, Inc.

  4.2(e)  Amended Loan Agreement with Aberdeen                     Exhibit 4.2(e) to Registrants
          Development Corporation and APA Optics, Inc.             Report on Form 10-K for fiscal
                                                                   year ended March 31, 2004

  4.3(a)  Loan Agreement between South Dakota Economic             Exhibit 4.3(a) to the June 1996 10-
          Development Finance and APA Optics, Inc.                 QSB


                                       48

=======================================================================================================
                                                                       PAGE NUMBER OR INCORPORATED
 NUMBER                   DESCRIPTION                                        BY REFERENCE TO
-------------------------------------------------------------------------------------------------------
  4.3(b)  Mortgage and Security Agreement - One Hundred            Exhibit 4.3(b) to the June 1996
          Day Redemption from APA Optics, Inc. to South            10-QSB
          Dakota Economic Development Finance Authority
          dated as of June 24, 1996

  4.4(a)  Subscription and Investment Representation               Exhibit 4.4(a) to the June 1996 10-
          Agreement of NE Venture, Inc.                            QSB

  4.4(b)  Form of Common Stock Purchase Warrant for NE             Exhibit 4.4(b) to the June 1996
          Venture, Inc.                                            10-QSB

  4.5(a)  Certificate of Designation for 2% Series A               Exhibit 4.5(a) filed as a part of
          Convertible Preferred Stock                              Registration Statement on Form S-
                                                                   3 (Commission File No. 333-
                                                                   33968)

  4.5(b)  Form of common stock warrant issued in connection        Exhibit 4.5(b) filed as a part of
          with 2% Series A Convertible Preferred Stock             Registration Statement on Form S-
                                                                   3 (Commission File No. 333-
                                                                   33968)

     4.6  Common Stock Purchase Warrant issued to                  Exhibit 4.6 to Registrant's Report
          Ladenburg Thalmann & Co. Inc. to purchase 84,083         on Form 10-K for fiscal year
          Shares                                                   ended March 31, 2000 ("2000 10-
                                                                   K")

     4.7  Share Rights Agreement dated October 23, 2000 by         Exhibit 1 to the Registration
          and between the Registrant and Wells Fargo Bank          Statement on Form 8-A filed
          Minnesota NA as Rights Agent                             November 8, 2000

     4.8  Common Stock Warrant Purchase Agreement with             Exhibit 4.8 to Form 8-K filed
          Peter Lee as part of CSP asset purchase                  March 31, 2003

 10.1(a)  Sublease Agreement between the Registrant and Jain-      Exhibit 10.1 to the Registration
          Olsen Properties and Sublease Agreement and Option       Statement on Form S-18 filed with
          Agreement between the Registrant and Jain-Olsen          the Chicago Regional Office of
          Properties                                               the Securities and Exchange
                                                                   Commission on June 26, 1986

 10.1(b)  Amendment and Extension of Sublease Agreement
          dated August 31, 1999                                    Exhibit 10.1(b) to 2000 10-K

*10.2(a)  Stock Option Plan for Nonemployee Directors              Exhibit 10.3a to Registrant's
                                                                   Report on Form 10-KSB for the
                                                                   fiscal year ended March 31, 1994
                                                                   (the "1994 10-KSB")

*10.2(b)  Form of option agreement issued under the plan           Exhibit 10.3b to 1994 10-KSB

   *10.3  1997 Stock Compensation Plan                             Exhibit 10.3 to Registrant's Report
                                                                   on Form 10-KSB for the fiscal
                                                                   year ended March 31, 1997


                                       49

=======================================================================================================
                                                                       PAGE NUMBER OR INCORPORATED
NUMBER                    DESCRIPTION                                        BY REFERENCE TO
-------------------------------------------------------------------------------------------------------
   *10.4  Insurance agreement by and between the Registrant        Exhibit 10.5 to Registrant's Report
          and Anil K. Jain                                         on Form 10-K for the fiscal year
                                                                   ended March 31, 1990

   *10.5  Form of Agreement regarding Repurchase of Stock          Exhibit 10.1 to Registrant's Report
          upon Change in Control Event with Anil K. Jain and       on Form 10-QSB for the quarter
          Kenneth A. Olsen                                         ended September 30, 1997
                                                                   ("September 1997 10-QSB")

   *10.6  Form of Agreement regarding                              Exhibit 10.2 to the September
          Employment/Compensation upon Change in Control           1997 10-QSB
          with Messrs. Jain and Olsen

    10.7  Form of Agreement regarding Indemnification of           Exhibit 10.7 to Registrant's Report
          Directors and Officers with Messrs. Jain, Olsen,         on From 10-K for the fiscal year
          Ringstad, Roth, Von Wald and Zuckerman                   ended March 31, 2002.

    10.8  Sublease agreement between Newport and APACN             Exhibit 10.8 to Registrant's Report
                                                                   of Form 10-QSB for the quarter
                                                                   ended June 30, 2003

    10.9  Sublease agreement between Veeco Compound                Exhibit 10.9 to Registrant's
          Semiconductor and APA Optics, Inc.                       Report of Form 10-K for the fiscal
                                                                   year ended March 31, 2004

   10.10  Ken Olsen Separation Agreement                           Exhibit 10.10 to Registrant's
                                                                   Report on Form 10-K for the fiscal
                                                                   year ended March 31, 2004

      14  Code of Ethics                                           Exhibit 14 to Registrant's Report
                                                                   on Form 10-K for the fiscal year
                                                                   ended March 31, 2004

      21  List of Subsidiaries

    23.1  Consent of Grant Thornton LLP
          Certification of Chief Executive Officer Pursuant to

    31.1  Section 302 of the Sarbanes-Oxley Act of 2002
          Certification of Chief Executive Officer and Principal
          Financial Officer Pursuant to Section 906 of the

    32.1  Sarbanes-Oxley Act of 2002

*Indicates  management contract or compensation plan or arrangements required to be filed as an exhibit
to  this  form.

50

Exhibit 4.2(e)

April 13, 2004

Dr. Anil Jain
APA Optics, Inc.
2950 NE 84th Lane
Blaine, MN 55449

Dear Dr. Jain,

The Aberdeen Development Corporation and APA Optics, Inc. acknowledge and agree to the following terms and conditions regarding the outstanding loans between the two parties:

- Aberdeen Development Corporation acknowledges receipt of $89,305.00 from APA Optics, Inc. to ADC's Wells Fargo bank account
- Aberdeen Development Corporation agrees to the release of the UCC Filing in the State of Minnesota #1859487 dated June 24, 1996 on the equipment located in Blaine, Minnesota which was renewed August 20, 2001 ( UCC Filing #20013130900028)
- Aberdeen Development Corporation will retain the UCC Filing in the State of South Dakota #20013130900028 dated November 9, 2001 on the equipment located in Aberdeen, SD
- APA Optics, Inc. will pay the Aberdeen Development Corporation $140,000 payable in seven equal payments of $20,000 starting June 30, 2004
- The interest rate on the loan will remain at 0% interest
- All other terms and conditions of the loan will remain in affect.

The above is correct and accurate and we consent to these terms and conditions.

APA Optics, Inc.                        Aberdeen Development Corporation

By:                                     By:
     -----------------------------           -----------------------------
     Dr. Anil K. Jain                        Larry Frost
     Its:  Chairman and President            Its:  President

                                       By:
                                            ------------------------------
                                            James C. Barringer
                                            Its:  Executive Vice-President


Exhibit 10.9

LEASE

ENTERED INTO AS OF JUNE __, 2004

BETWEEN

VEECO COMPOUND SEMICONDUCTOR INC., Landlord

AND

APA OPTICS, INC., Tenant


LEASE

1. PARTIES. THIS LEASE is entered into as of this _____ day of June, 2004, by and between Veeco Compound Semiconductor Inc., a Minnesota corporation (hereinafter "Landlord"), and APA Optics, Inc. a Minnesota corporation (hereinafter "Tenant"). For good and valuable consideration, the parties agree to these terms as evidenced by their signatures below. From time to time this agreement is referred to below as the "Lease."

2. EXHIBITS. Attached to and made a part of this Lease are the following

exhibits:

          Exhibit  A.    Site Plan showing the Building, the Leased Premises and
                         the  Common  Areas.

          Exhibit  B.    List of Hazardous Materials to be used by Tenant in the
Leased  Premises.

          Exhibit  C     List  of  all waste materials to be generated by Tenant
                         on the  Leased  Premises.

3. DEFINITIONS. The following terms as used in this Lease shall have the meanings set forth below:

(a) "BUILDING": The structure located at 4900 Constellation Drive, St. Paul, Minnesota 55127, known as the Process Integration Center (PIC) and shown on Exhibit A attached hereto, in which the Leased Premises are located.

(b) "COMMON AREAS": The space marked as such on Exhibit A attached hereto and located in the PIC and available for the common or joint use and benefit of the occupants of the Building.

(c) "HAZARDOUS MATERIALS": All substances, materials and wastes that are or become regulated or classified as hazardous, toxic or solid waste under any Applicable Environmental Law, including without limitation, oil, flammable explosives, asbestos, area formaldehyde, radioactive materials or waste, or other hazardous, toxic, contaminated or polluting materials, substances or wastes.

(d) "APPLICABLE ENVIRONMENTAL LAW": Any applicable law, statute, ordinance, order, rule or regulation relating to or imposing liability or standards of conduct concerning any hazardous, toxic or dangerous waste, substance or materials pertaining to health or the environment, including without limitation, the Comprehensive Environmental Response, Compensation and Liability Act of 1980, as amended, and the Resource Conservation and Recovery Act of 1976, as amended.


(e) "LEASED PREMISES": The space marked as such on Exhibit A attached hereto and located in the PIC. The Leased Premises include four undesignated parking spaces in the Landlord's parking lot.

(f) "LANDLORD PREMISES": That portion of the Building which is not a portion of the Leased Premises or the Common Areas.

4. TERM. Landlord hereby leases to Tenant and Tenant hereby leases from

Landlord the Leased Premises for a term of three (3) years commencing on the Rent Commencement Date (as defined in Section 5(a) below). This Lease may be terminated by either party upon 90 days' prior written notice. The Tenant agrees that prior to, or upon, the effective date of the termination of this Lease, the Tenant will remove all equipment associated with it's business, at the Tenant's expense, and without disruption to the Landlord's business. Tenant agrees to the leave the Leased Premises in clean and working order, ordinary wear and tear excepted, and free of any and all Hazardous Materials (other than those which Tenant can prove were present when Tenant took possession).

5. RENT; SECURITY DEPOSIT.

(a) Tenant shall pay no rent, and the term shall not commence, until the improvements described in Section 5(d) of this Lease are completed and the Tenant Machine, as defined in Section 5(d) below, is ready for initial tool startup as provided in the agreement between Landlord and Tenant for Tenant's purchase of the Tenant Machine (the "Rent Commencement Date"). If the Rent Commencement Date falls on a day other than the first day of a calendar month, the rent for that month shall be prorated based on the actual number of days in that month.

(b) Prior to commencement of Tenant's occupancy, Tenant shall pay $28,200 as a security deposit and shall pay the first month's rent ($9,400) in advance. Thereafter, Tenant shall pay the monthly rent of $9,400 on or prior to the first of every month for the term of this Lease.

(c) Any rent payment due hereunder that is not received by Landlord within 5 business days after its due date shall be subject to a 1% late fee for each 5 business day period (or fraction thereof) this it is late.

(d) The Landlord agrees to make the necessary lease hold improvements to the clean room area necessary to house the Tenant owned, Veeco D180 MOCVD equipment ("Tenant Machine"). Landlord shall complete the leasehold improvements in accordance with the requirements of applicable building codes and shall be responsible for building code compliance for real property that houses the Tenant Machine.

6. USE. Tenant shall use the Leased Premises only for the growth and

characterization of GaN epitaxial wafers using a MOCVD reactor, and other activities directly related thereto. The Tenant is specifically prohibited from using arsine (AsH3) or phosphine (PH3) gas within the Landlord's building.

2

7. RENOVATIONS. Landlord shall retain a contractor (at Landlord's expense) to undertake any renovations Landlord deems necessary or appropriate in order to separate the Leased Premises from the Landlord Premises and Common Areas, including without limitation firewalls, dividing walls, cranes/winches, card-key readers, etc., as well as a separate fan and stack for exhausting any air emissions, and for removing all of the foregoing at the end of the term of the Lease.

8. PEACEFUL POSSESSION. So long as Tenant is not in default under this Lease and subject to the remainder of this Section 8, Tenant shall have quiet and peaceful possession of the Leased Premises, subject to all of the terms and conditions set forth in this Lease. Tenant shall designate not more than four (
4) employees who shall have access to the Leased Premises at all times and shall provide Landlord with written notice of the names of such employees. Tenant shall perform suitable background, export clearance and other checks of such employees to ensure their suitability to work in a sensitive area like the Leased Premises. The four designated employees of Tenant will have 24-hour access, 7 days per week, to the building, but only the Tenant owned equipment, common areas, and characterization area and equipment. Any other employees or other persons associated with Tenant may enter the Leased Premises only with the prior written permission of Landlord. Tenant shall ensure that employees of Tenant and other persons associated with Tenant at the Leased Premises will communicate with Landlord personnel subject to the conditions of Section 20 of this Lease.

9. COMMON AREAS. Subject to Section 8 of this Lease, Landlord hereby grants to Tenant and its representatives, agents, invitees and employees the non-exclusive right of use of the Common Areas, subject to reasonable rules and regulations for the use thereof as may be prescribed from time to time by Landlord.

10. SIGNS. Other than those approved in writing by Landlord in its sole discretion, Tenant shall place no signs (portable, mobile or fixed), flags, posters, or other advertising or promotional materials anywhere within or around the exterior of the Building without first having obtained Landlord's prior written approval of same.

11. REPAIRS; CLEANING; DISPOSAL OF HAZARDOUS MATERIALS WASTE.

(a) Tenant shall, at its own cost and expense, take good care of and make necessary repairs to the interior of the Leased Premises, upon notification and approval of Landlord. Landlord is responsible for janitorial services in the office and Common Areas. Tenant shall be responsible for janitorial services or self-cleaning in the clean room housing the Tenant's MOCVD reactor (the "Tenant Machine"). Tenant shall maintain the Leased Premises at a level of cleanliness and good repair as required by Landlord, ordinary wear and tear excepted.

(b) Tenant shall store and dispose of all of Tenant's waste containing Hazardous Materials at its own expense and in accordance with applicable laws. Without limiting the foregoing, whenever such waste is transported through the Building for disposal, it shall be properly packaged, and an authorized employee of Landlord shall accompany Tenant's personnel throughout the process. No Hazardous Materials shall be disposed of in

3

any sink, drain, toilet or otherwise on the Leased Premises or other premises of Landlord.

12. MECHANICS' LIENS. Should any mechanics' or other liens be filed against the Leased Premises or any part thereof by reason of Tenant's acts or omissions or because of a claim against Tenant, Tenant shall cause the same to be cancelled and discharged of record by bond or otherwise within ten (10) days following notice from Landlord of the filing of such lien. However, in the event Tenant believes such lien has been wrongfully filed, Tenant shall have the right to defend itself against any such lien so long as Tenant notifies and indemnifies Landlord.

13. UTILITY CHARGES. The rent shall include all utility charges, included water, CDA, sewer and septic, electrical, HVAC, and reasonable amounts of pure H2 and N2 as determined necessary, by Landlord, to run a Veeco D180 MOCVD reactor in a 24/7 production mode. Unreasonable amount of utilities, as determined by Landlord, will be charged to Tenant in addition to the monthly rent. In addition, Landlord will supply two office phone lines to be used by Tenant for business purposes only. Unreasonable charges to these phone lines will be charged separately to Tenant in addition to the rent. Tenant will not have access to Landlord's computer network. Landlord will, at Tenant's request and expense, install two analog phone lines for modem access or two DSL phone lines (if available), one in each office, to be used by Tenant for internet access, of which the billing of these lines will be direct to Tenant.

14. INDEMNITY AND RELATED PROVISIONS. Tenant will indemnify Landlord and save it harmless from and against any and all claims, actions, damages, liability, expenses and attorneys' fees in connection with loss of life, personal injury, and/or damage to property arising from or out of any occurrence in, upon, or at the Leased Premises, or the occupancy or use by Tenant of the Leased Premises, or any part thereof, or occasioned wholly or in part by any act or omission of Tenant, its agents, contractors, employees, servants, lessees, concessionaires, or invitees, including, without limitation, any and all claims, actions, damages, liability, penalties, assessments, natural resource damages, response costs (such as the cost of any testing, medical or other monitoring, cleanup, or other required response action) expenses and consultants and attorneys' fees resulting from or in any way connected with the presence, release, threatened release, or disposal by Tenant, in on, or under the Leased Premises of any hazardous substances (as defined in CERCLA), hazardous wastes (as defined in RCRA), oils, radioactive materials, asbestos in any form or condition, any pollutant or contaminant or hazardous, dangerous or toxic chemicals, materials or substances within the meaning of any Applicable Environmental Law, provided that in the event that both Landlord and Tenant are at fault in any respect of any such claim, Tenant shall have no liability to Landlord hereunder, except to the extent of the gross negligence or willful misconduct of Landlord. In case Landlord shall be made a party to any litigation commenced by or against Tenant, then Tenant shall protect and hold Landlord harmless and shall pay all costs, expenses, and reasonable attorneys' fees incurred or paid by Landlord in connection with such litigation. except to the extent of the gross negligence or willful misconduct of Landlord, or Tenant action against Landlord for any default hereunder or breach of this Lease by Landlord.

Landlord will indemnify Tenant and save it harmless from and against any and all claims, actions, damages, liability, expenses and attorneys' fees in connection with loss of life, personal injury, and/or damage to property arising from or out of any occurrence in, upon, or at the

4

Landlord Premises, or the occupancy or use by Landlord of the Landlord Premises, or any part thereof, or occasioned wholly or in part by any act or omission of Landlord, its agents, contractors, employees, servants, lessees, concessionaires, or invitees, including, without limitation, any and all claims, actions, damages, liability, expenses and attorneys' fees resulting from or in any way connected with the presence, release or disposal, in or under the Landlord Premises of any hazardous substances (as defined in CERCLA), hazardous wastes (as defined in RCRA), oils, radioactive materials, asbestos in any form or condition, any pollutant or contaminant or hazardous, dangerous or toxic chemicals, materials or substances within the meaning of any Applicable Environmental Law; provided, that in the event that both Landlord and Tenant are at fault in respect of any such claim, Landlord shall have no liability to Tenant hereunder, except to the extent of the gross negligence or willful misconduct of Tenant. In case Tenant shall be made a party to any litigation commenced by or against Landlord , then Landlord shall protect and hold Tenant harmless and shall pay all costs, expenses, and reasonable attorneys' fees incurred or paid by Tenant in connection with such litigation. except to the extent of the gross negligence or willful misconduct of Tenant, or any action by Landlord against Tenant for any default hereunder or breach of this Lease by Tenant.

15. INSURANCE.

(a) Landlord shall maintain insurance against fire, vandalism and malicious mischief and other perils as are from time to time commonly included in the type of insurance known as "special form coverage" (or its equivalent), insuring the building structure for its full insurable value.

(b) During the Term, at Tenant's sole cost and expense, Tenant shall maintain: (i) insurance against fire, vandalism and malicious mischief and such other perils as are from time to time commonly included in the type of insurance known as "special form coverage" (or its equivalent) and business interruption, insuring Tenant's fixtures, furniture, furnishings, floor coverings and other Tenant improvements, alterations or additions in or to the Leased Premises for 100% of the full replacement cost; (ii) commercial general liability insurance for claims for personal injury, death and property damage for risks occurring in or upon or about the Leased Premises and on any sidewalks directly adjacent to the Leased Premises with combined single limits in an amount not less than $6,000,000; (iii) in a like amount, contractual liability insurance covering Tenant's indemnity obligations hereunder; (iv) commercial automobile liability coverage; $1,000,000 combined single limit; must indicate coverage for any auto or owned, hired or borrowed, and non-owned vehicles; and (v) workers' compensation and employers liability coverage of $500,000 each accident, $500,000 disease-policy limit, $500,000 disease - each employee. All such policies shall show Landlord as an additional insured and shall be satisfactory to Landlord. All such policies shall contain express endorsements that (i) such insurance may not be cancelled or amended with respect to Landlord without ten (10) days written notice by certified mail to Landlord by the insurance company, and (ii) Tenant and insurer

5

waive their right of subrogation against Landlord and its affiliates. Policies should have minimum AM Best rating of A- and a financial size of VII or higher. Satisfactory evidence of such insurance shall be delivered to Landlord prior to Tenant's possession of the Leased Premises, and renewal policies or certificates shall be delivered to Landlord at least thirty (30) days prior to the expiration of any existing policies.

(c) Tenant shall give Landlord prompt written notice of any accidents, casualty, damage or other similar occurrence in or to the Leased Premises of which Tenant has knowledge.

16. DAMAGE BY CASUALTY; CONDEMNATION. If the Leased Premises are damaged by fire, the elements or other casualty, Landlord, at its option, may either repair all damage and restore the Leased Premises to their condition immediately prior to the damage or terminate this Lease by notice to Tenant within sixty
(60) days of such casualty. Rent shall abate during the restoration period if Tenant is precluded from doing business. If the Building is damaged or destroyed to an extent of at least 25% of the then respective replacement cost by any cause whatsoever (whether or not the Leased Premises are damaged), Landlord shall be entitled to terminate this Lease by notice to Tenant given on or before 60 days after the occurrence of such casualty. Tenant shall have the right to terminate this Lease upon 60 days' written notice to Landlord in the event of any casualty which prevents Tenant from full operation of its business for more than 60 days, or if Landlord cannot repair the Leased Premises with in 90 days.

If the whole of the Leased Premises shall be condemned or taken either permanently or temporarily for any public or quasi-public use or purpose under any statute or by right of eminent domain, or by private purchase by the government, in lieu thereof, then in that event, the term of this Lease shall cease and terminate from the date when possession is taken thereunder pursuant to such proceeding or purchase. The rent shall be adjusted as of the time of such termination and any rent prepaid for a period thereafter shall be refunded. Neither Landlord nor Tenant shall have any further liability in respect of such termination. In the event a portion of the Leased Premises or a portion of the Building shall be so taken (even though the Leased Premises may not have been affected by the taking of some other portion of the Building) Landlord may elect to terminate this Lease from the date when possession is taken thereunder pursuant to such proceeding or purchase, or Landlord may elect to repair and restore, at its own expense, the portion not taken and thereafter the rent shall be reduced proportionately to the portion of the Leased Premises taken. If the portion of the Leased Premises so taken substantially impairs the usefulness of the Leased Premises for the use as provided in Section 6 of this Lease or exceeds fifty percent (50%) of the square foot area of the Leased Premises, either party may terminate this Lease on the date when Tenant is required to yield possession. Tenant shall not be entitled to any portion of the award for the fee or leasehold or any element thereof, and the entire award shall belong to Landlord, provided, however, Tenant may apply for reimbursement from the condemning authority for moving expenses, loss of good will, movable trade fixtures, and equipment provided payment of any such reimbursement or award to Tenant shall not reduce the amount of any condemnation award that would otherwise be payable to Landlord.

17. INSURANCE HAZARDS. Except for the use as provided in Section 6 of this Lease, Tenant shall permit no use of the Leased Premises which might render void, or cause the

6

cancellation or rate increase of any insurance carried by Landlord or which would increase the risk of fire or other catastrophe, or which may be a health or safety hazard

18. DEFAULT BY TENANT. The occurrence of any one or more of the following events shall constitute a default and breach of this Lease by Tenant:

(a) failure to pay rent when due;

(b) failure to maintain insurance as required hereunder with Landlord listed as a named insured;

(c) failure to comply with confidentiality, non-disparagement and non-solicitation obligations hereof;

(d) the appointment of a receiver to take possession of all or substantially all of the assets of Tenant, a general assignment by Tenant for the benefit of creditors, or any action taken or suffered by Tenant under insolvency or bankruptcy laws; or

(e) failure to comply with any other provision of this Lease.

If any such default is not cured within 30 days after written notice thereof from Landlord to Tenant, Landlord may terminate this Lease and Tenant shall immediately surrender possession of the Leased Premises to Landlord. Notwithstanding the foregoing, if the default is related to a breach by Tenant of its obligations under Sections 11(b) or 27 hereof, Landlord may terminate this Lease immediately and Tenant shall have no opportunity to cure the default. In addition, notwithstanding the foregoing, no notice shall be required, no cure period shall be afforded and this Lease shall automatically and immediately terminate upon the occurrence of the events described in Section 18(d) above.

If Landlord terminates this Lease because of a default by Tenant, Tenant shall immediately pay Landlord all rent then due.

19. DEFAULT BY LANDLORD. The occurrence of any one or more of the following events shall constitute a default and breach of this Lease by Landlord:

(a) failure to comply with confidentiality, non-disparagement and non-solicitation provisions hereof;

(b) the appointment of a receiver to take possession of all or substantially all of the assets of Landlord, a general assignment by Landlord for the benefit of creditors, or any action taken or suffered by Landlord under insolvency or bankruptcy laws; or

(c) failure to comply with any other provision of this Lease.

If any such default is not cured within 30 days after written notice thereof from Tenant to Landlord, Tenant may terminate this Lease. Notwithstanding the foregoing, if the default is

7

related to a breach by Landlord of its obligations under Section 27 hereof, Tenant may terminate this Lease immediately and Landlord shall have no opportunity to cure the default.

20. CONFIDENTIALITY, NON-DISPARAGEMENT AND NON-SOLICITATION. Each of Landlord and Tenant shall keep confidential any information of whatever nature it learns about the other party and the business and products of the other party ("Confidential Information") by virtue of being in the Building. Confidential Information shall not include information that is in the public domain at the time of its use or disclosure through no fault of the party receiving the information ("Receiving Party"). If the Receiving Party is requested or required to disclose any Confidential Information of the other party pursuant to a subpoena, court order, statute, rule, regulation or similar requirement ("Legal Requirement"), the Receiving Party shall provide prompt notice thereof to the other party so that the other party may seek an appropriate protective order or other remedy or waive compliance with the provisions of this Agreement. If the Receiving Party is legally compelled to disclose such Confidential Information, or if the other party waives compliance with this provision of the Lease in writing, the Receiving Party may disclose such Confidential Information in accordance with, but solely to the extent necessary to comply with the Legal Requirement.

Landlord and Tenant shall not, and shall not permit their employees to, make any negative or disparaging statements about the other party or the business or products of the other party to any third party.

During the term, Tenant shall not solicit for employment or hire any employee of Landlord or any person employed by Landlord within the previous 90 days.

During the term, Landlord shall not solicit for employment or hire any person then designated by Tenant pursuant to Section 8 of this Lease as a Tenant employee entitled to access to the Leased Premises or any person designated as such within the previous 90 days.

Tenant shall acknowledge that Landlord has on Landlord's premises United States government owned equipment and is conducting US government research on behalf of a government contracting company. Tenant is strictly prohibited from access to this equipment, the wafers it produces, any and all data associated with the contract, including, but not limited to, characterization data as a result of the contract. Tenant agrees, under penalty of Lease default, that it will not attempt to obtain any information, not matter how trivial, about this equipment, wafers, or the contract in general. Tenant also agrees not to solicit verbal information about this contract, in any form, from Landlord's employees.

21. WAFER CHARACTERIZATION. During the term of this Lease, Tenant has shared access and a reasonable right of use to all Veeco-owned wafer characterization equipment. Tenant will be held accountable for repairs to any equipment that is damaged by improper use or abuse by Tenant or its agents or employees. Tenant agrees to receive training on this equipment prior to use and determined adequate, in writing, by Landlord. Tenant and Landlord agree to work together in determining who has priority in the use of the characterization equipment, with the final determination being made by Landlord.

22. HOLDOVER. Any holdover after the expiration of the term, with or without the consent of Landlord, shall be construed to be a tenancy from month to month and shall otherwise

8

be on the terms and conditions herein specified so far as applicable except that the monthly rent shall be increased to 150% of the monthly rent in effect immediately prior to the holdover.

23. ESTOPPEL STATEMENTS AND LANDLORD'S SUBORDINATION. Tenant agrees to complete and return to Landlord any reasonable written statements which Tenant may truthfully make concerning the Leased Premises or this Lease as Landlord may request. Such statements are limited to declarations: (a) ratifying this Lease;
(b) expressing the commencement and termination dates hereof; (c) certifying that this Lease is in full force and effect and has not been assigned, modified, supplemented or amended (except by such writings as shall be stated); (d) that all conditions under this Lease to be performed by Landlord have been satisfied, or stating those unsatisfied conditions claimed by Tenant; and (e) that there are no defenses or offsets against the enforcement of this Lease by Landlord, or stating those claimed by Tenant.

24. ASSIGNMENT AND SUBLETTING. Tenant shall not assign this Lease or sublet the Leased Premises without Landlord's prior written consent, which consent may be withheld by Landlord in its sole discretion. Landlord's consent to any assignment or subletting shall not constitute a waiver of the necessity for such consent to any subsequent assignment or subletting. This prohibition against assignment or subletting shall be construed to include a prohibition against any assignment or subletting by operation of law. Notwithstanding any consent given by Landlord, Tenant shall remain liable for all of its obligations herein unless released in writing by Landlord.

Landlord may assign this Lease on written notice to Tenant.

25. WAIVER. Failure of Landlord or Tenant to insist upon the strict performance of any provision or to exercise any option hereunder shall not be construed as a waiver of the future performance of any such provision or option. No provision of this Lease shall be deemed to have been waived unless such waiver is in writing and signed by the waiving party. No payment by Tenant or receipt by Landlord of an amount less than the full amount of rent due shall be deemed to be other than on account of the earliest rent then unpaid, nor shall any endorsement or statement on any check or any letter accompanying any check or payment of rent be deemed an accord and satisfaction, and Landlord may accept such check or payment without prejudice to Landlord's right to recover the balance of such rent or pursue any other remedy provided in this Lease. Neither acceptance of the keys nor any other act or thing done by Landlord or any agent or employee of Landlord during the Term herein demised shall be deemed to be an acceptance of a surrender of the Leased Premises, excepting only an agreement in writing signed by Landlord, accepting or agreeing to accept such a surrender.

26. ACCESS TO PREMISES. Upon 24 hours' prior written notice, Landlord shall have the right to enter the Leased Premises during reasonable business hours to make repairs, alterations or improvements (to the Leased Premises or otherwise as Landlord may deem necessary or desirable, or to inspect, or to exhibit the Leased Premises to prospective purchasers or mortgagees of Building. In the event of an emergency, Landlord may enter the Leased Premises at any time without prior notice to Tenant.

27. COMPLIANCE WITH LAW; ENVIRONMENTAL MATTERS. Tenant will obtain all necessary permits and approvals for the conduct of its business within the Leased Premises and will comply with all Applicable Environmental Laws and all lawful requirements

9

of any governmental body, agency or department regarding the use, condition or operation of the Leased Premises.

To the extent that the Leased Premises will house petroleum or any petroleum products, asbestos, urea formaldehyde, foam insulation or any other chemical, material or substance, exposure to which may or could pose a health hazard, the possession and use of such materials will be in accordance with law, including any applicable regulations. Tenant will not store or use within the Leased Premises any hazardous material not listed on Exhibit B and will not use or store within the Leased Premises any of such materials in quantities greater than those specified on Exhibit B. In addition, Tenant shall not generate any waste products other than such waste products set forth on Exhibit C.

To the extent that the use which Tenant makes or intends to make of the Leased Premises will result in the manufacturing, treatment, refining, transportation, generation, storage, disposal or other release or presence of any hazardous substance or solid waste on the Leased Premises, such use will be in accordance with law, including any applicable regulations. For purposes of this paragraph, the terms "hazardous substance" and "release" will have the meanings specified in CERCLA, and the term "disposal" (or "disposed") will have the meaning specified in RCRA; provided, in the event either CERCLA or RCRA is amended so as to broaden the meaning of any term defined thereby, such broader meaning will apply subsequent to the effective date of such amendment, and provided, further, to the extent that the laws of the State of Minnesota establish a meaning for "hazardous substance," "release," or "disposal" which is broader than that specified in either CERCLA or RCRA, such broader meaning will apply; provided, further, that the term "hazardous substance" will also include those listed in the U.S. Department of Transportation Table (49 C.F.R. 172.101) and amendments thereto from time to time.

Tenant shall promptly notify Landlord of any violation or alleged violation of any Applicable Environmental Laws of which Tenant becomes aware.

Tenant shall appoint one of its employees to be responsible for environmental, health and safety ("EH&S") matters on the Leased Premises. Tenant shall retain liability for any damages or injuries caused by Tenant. Except as provided in Section 5(d) above, Tenant shall be responsible for maintaining compliance with Applicable Environmental Law respecting the Leased Premises and Tenant's activities therein and shall bear all associated costs to the extent they relate to Tenant's activities on the Leased Premises. Tenant shall pay its proportionate share of the cost of any environmental audits or reports required by any governmental authority to the extent they relate to Tenant's activities on the Leased Premises. In the event of an emergency situation, Landlord may have immediate access to the Leased Premises. Tenant shall be responsible for ensuring toxic material containment, and toward this end, shall develop a program for equipment maintenance that eliminates any risk of disruption of Landlord's operations.

Landlord shall be responsible for maintaining compliance with all governmental regulations with respect to the Landlord Premises to the extent necessary to permit Tenant to carry on its activities on the Leased Premises, and shall consider Tenant's operations in its EH&S planning.

10

28. PERSONAL PROPERTY TAXES. Tenant shall be responsible for any taxes levied or assessed against personal property, fixtures or furniture placed by Tenant on the Leased Premises.

29. COMPLIANCE WITH APPLICABLE LAWS. Tenant agrees to comply with all applicable laws concerning its operations at the Leased Premises, including, without limitation, requirements under ITAR and under U.S. export control laws relating to the technology present at the Leased Premised and in Landlord's portion of the Building. If Tenant determines that an export license is required for its personnel working at the Leased Premises or otherwise in connection with its activities at the Leased Premises, Tenant shall first obtain the written consent of Landlord prior to applying for any such license or other authority, which consent shall not be unreasonably withheld or delayed.

30 MISCELLANEOUS PROVISIONS.

(a) Whenever the singular number is used in this Lease and when required by the context, the same shall include the plural, and the masculine gender shall include the feminine and neuter genders, and the word "person" shall include corporation, firm, partnership, association, or any other similar entity. If Tenant constitutes more than one person, the obligations imposed under this Lease upon Tenant shall be joint and several.

(b) The marginal headings or titles to the paragraphs of this Lease are not a part of this Lease and shall have no effect upon the construction or interpretation of any part of this Lease.

(c) This instrument contains all of the agreements and conditions made between the parties to this Lease and may not be modified orally or in any other manner other than by an agreement in writing signed by all the parties to this Lease or their respective successors in interest.

(d) Time is of the essence of each term and provision of this Lease.

(e) Tenant warrants that it has not had any dealings with any realtor, broker, or agent in connection with the negotiation of this Lease and agrees to pay and to hold Landlord harmless from any cost, expense, or liability for any compensation, commission, or charges claimed by any realtor, broker, or agent with respect to this Lease or the negotiation of this Lease.

(f) All rights and obligations under this Lease shall bind and inure to the benefit of the successors and permitted assigns of the parties hereto.

(g) If Landlord incurs legal fees to enforce any provision of this Lease, Tenant shall pay such fees and any costs associated therewith.

(h) Tenant shall, in the event any proceedings are brought for the foreclosure of, or exercise of the power of sale under, any mortgage or deed of trust made by Landlord covering the Leased Premises, attorn to the purchaser

11

upon any such foreclosure or sale and recognize such purchaser as the Landlord under this Lease so long as Landlord is not in default under the Lease.

(i) Tenant agrees that this Lease shall, at the request of Landlord, be subordinate to any first mortgage or deed of trust that may hereafter be placed upon the Leased Premises and to any and all advances to be made thereunder, and to the interest thereon, and all renewals, replacements and extensions thereof, provided the mortgagee or trustee named in such mortgage or deed of trust shall agree to recognize the Lease of Tenant in the event of foreclosure if Tenant is not in default. Tenant also agrees that any mortgagee or trustee may elect to have this Lease a prior lien to its mortgage or deed of trust, and in the event of such election and upon notification by such mortgagee or trustee to Tenant to that effect, this Lease shall be deemed prior in lien to the said mortgage, or deed of trust, whether this Lease is dated prior to or subsequent to the date of said mortgage or deed of trust. Tenant agrees that, upon the request of Landlord, any mortgagee or any trustee, it shall execute whatever instruments may be required to carry out the intent of this paragraph.

(j) All notices must be sent in writing to Landlord at:

Veeco Compound Semiconductor Inc. 4900 Constellation Dr.

St. Paul, MN 55127
Attn: General Manager

with a copy to:

Veeco Instruments Inc. 100 Sunnyside Blvd, Suite B Woodbury, NY 11797 Attn: General Counsel

and to Tenant at:

APA Optics, Inc.
2950 NE 84th Avenue
Blaine, MN 55449
Attn: Dan Herzog, Controller

(n) This Lease shall be governed by, and construed in accordance with the laws of the State of Minnesota.

(o) Tenant agrees that it shall pay on demand all expenses incurred by Landlord in enforcing its rights hereunder, including, but not limited to, collection costs and Landlord's reasonable attorneys' fees. In addition, when Tenant requests Landlord to take any action not specifically required

12

of it hereunder, Tenant shall reimburse Landlord for its reasonable expenses therefor.

(p) LANDLORD AND TENANT EXPRESSLY DISCLAIM ANY IMPLIED WARRANTY THAT THE LEASED PREMISES ARE SUITABLE FOR TENANTS INTENDED COMMERCIAL PURPOSE, AND TENANT'S OBLIGATION TO PAY RENT HEREUNDER IS NOT DEPENDENT ON THE CONDITION OF THE LEASED PREMISES OR THE PERFORMANCE BY LANDLORD OF ITS OBLIGATIONS HEREUNDER, AND, EXCEPT AS OTHERWISE PROVIDED HEREIN, TENANT SHALL CONTINUE TO PAY THE RENT THROUGHOUT THE TERM, WITHOUT ABATEMENT, SETOFF, OR DEDUCTION, NOTWITHSTANDING ANY BREACH BY LANDLORD OF ITS OBLIGATIONS HEREUNDER, WHETHER EXPRESS OR IMPLIED. LANDLORD AND TENANT EXPRESSLY AGREE AND ACKNOWLEDGE THAT THE DISCLAIMER PROVIDED IN THIS SECTION 30 DOES NOT APPLY TO ANY WARRANTY OF ANY TYPE RESPECTING THE SEPARATE AGREEMENT FOR THE PURCHASE OF THE TENANT MACHINE NOR TO WHETHER THE LEASEHOLD IMPROVEMENTS TO BE INSTALLED BY LANDLORD ARE ADEQUATE FOR THE TENANT MACHINE TO OPERATE IN THE MANNER PROVIDED FOR IN SAID PURCHASE AGREEMENT.

IN WITNESS WHEREOF, the parties hereto have hereunto set their hands the day and year first written above.

LANDLORD: TENANT:

Veeco Compound Semiconductor Inc. APA Optics, Inc.

By __________________________________ By _____________________________________ Its ______________________________ Its _________________________________

13

EXHIBIT A

SITE PLAN SHOWING THE BUILDING, THE LEASED PREMISES AND THE COMMON AREAS


EXHIBIT A, CONT.

SITE PLAN SHOWING THE BUILDING, THE LEASED PREMISES AND THE COMMON AREAS


                                    EXHIBIT B

     LIST OF HAZARDOUS MATERIALS TO BE USED BY TENANT IN THE LEASED PREMISES

----------------------------------------------------------------------------------------
1)   SOURCE MATERIALS                     2)   CLEANING MATERIAL
     a)   TMG                                  a)   HNO3
     b)   TEG                                  b)   H2SO4
     c)   TMA                                  c)   HF
     d)   TEA                                  d)   H2O2
     e)   TMI                                  e)   NH4OH
     f)   SiH4 ( 10 ppm in H2 or N2)           f)   IPA
     g)   Si2H6 ( 10 ppm H2 or N2)             g)   Acetone
     h)   CP2Mg                                h)   Methanol
     i)   NH3                                  i)   Ethylene Glycol (coolant for bubblers)
     j)   HCl (gas: 5-15% in H2)
     k)   Fe(C5H5)2 (ferrocene)
     l)   (CH3)2NNH2 (Dimethylhydrazine)
     m)   (C6H5)NHNH2  (Phenylhydrazine)
     n)   CH3-(CH2)2-NH2/C3H9N (n-
          propylamine)
----------------------------------------------------------------------------------------


EXHIBIT C

LIST OF ALL WASTE MATERIALS TO BE GENERATED BY TENANT ON THE LEASED PREMISES

GaN
AlN
AlGaN
InGaN
HNO3      (nitric  acid)
H2SO4     (sulfuric  acid)
HF        (hydrofluoric  acid)
H2O2      (hydrogen  peroxide)
NH4OH     (ammonium  hydroxide)
IPA       (isopropyl  alcohol)
Acetone
Methanol

Ethylene Glycol (coolant for bubblers)
Ammonia
Nitrogen
Hydrogen

SUBSTRATE MATERIALS
Si
Al2O3
SiC
ZnO
GaN

AlN


PART A
REVISED EMPLOYMENT TERMS FOR KEN OLSEN

1. Ken Olsen will reduce his hours of work to 20 hours/week (instead of his current 40 hours/week) starting June 1, 2003 until December 31, 2003 due to work slow down at the present time. During this time, Ken Olsen will maintain all the benefits he otherwise participated in with the Company as of June 1, 2003. The Company, however, retains the rights to recall Ken Olsen for increased or full time work at any time in future, if needed. In consideration of this right to recall, the Company will guarantee at least 20 hours/week work till December 31, 2003, resulting in proportional adjustments (actual hours vs. 40 hours/week) in compensation.

2. The Company may, at the end of the guaranteed period, elect to continue Ken Olsen's employment under the terms of the employment package as provided below in item C. This employment package may also be provided within the guarantee period with the mutual consent of Ken Olsen and the Company.

3. If Ken Olsen, however, does not agree to the recall to full-time status within fifteen (15) days from the date of recall, as defined in item 1 above, or decides to terminate employment of his own free will during the guarantee period, or terminates the employment on his own free will while employed full time (during, before or after the guarantee period) the employment package (see Item C below) will NOT be provided.

4. If Ken Olsen is not reinstated for full time work on or before January 1, 2004, Ken Olsen may terminate any employment with the Company on his free will and still receive the benefits under Part C in a lump sum as a severance package.

5. Ken Olsen will be entitled to the balance of any unpaid compensation under Part C as a severance package, if his employment is terminated by the Company after January 1, 2004 for any reason other than a just cause involving misconduct of Ken Olsen.

PART B
CERTAIN PRIOR AGREEMENTS

The Company acknowledges that Ken Olsen entered in to certain Agreements regarding Repurchase of Stock and Employment/Compensation upon Change in Control Event on August 20, 1997, as approved by the Board of Directors at the time. None of the current outside Board Members were on the Board or part of the Management of the Company at the time of the Agreements. Therefore, those agreements will remain as such without any considerations at present.


PART C
POST DECEMBER 31, 2003 EMPLOYMENT PACKAGE

In recognition of the outstanding contributions from Ken Olsen, the following Employment Package is provided by the Board of Directors as pertaining to the terms and conditions outlined above in the Section - Future Employment of Ken Olsen:

1. Fifteen (15) months of full time salaried employment (pay rate equivalent to pay rate prior to this agreement, which is $96,900 per year), starting January 1, 2004. During the term of this agreement Ken Olsen will be available to APA Optics, and will not be employed elsewhere. Olsen also has the option to voluntarily resign from his employment and take any unused portion of the compensation under the employment package as a lump sum, if he chooses.

2. During the term of this employment package, Ken Olsen will not be provided any benefits at the Company's expense. However, Ken Olsen may participate in any standard benefit provided by the Company electing to so participate and by providing for a deduction from his compensation for the cost of the benefit or reimbursing the full amount of expenses incurred by the Company in providing the designated benefits.


Exhibit 14

APA OPTICS, INC.

CODE OF ETHICS FOR PRINCIPAL EXECUTIVE OFFICER AND
SENIOR FINANCIAL OFFICERS

APA expects the highest ethical conduct from its principal executive officer and senior financial officers. Your full compliance with this Code and with APA's Code of Business Conduct and Ethics is mandatory. In addition, you are expected to foster a culture of transparency, integrity and honesty which will encourage compliance by all employees with APA's Code of Business Conduct and Ethics, in letter and in spirit.

CONFLICTS OF INTEREST
As an APA principal executive officer or senior financial officer, you must avoid any investment, interest or association that interferes, might interfere, or might appear to interfere, with your independent exercise of judgment in APA's best interests.

Situations in which your personal interests conflict with your independent exercise of judgment on behalf of APA may include (1) situations in which you can use your position at APA for personal gain (e.g. causing APA to enter into a business transaction with your relatives or friends) or (2) situations which develop into actual or potential conflicts due to factors beyond your control (e.g. the bank at which your wife is an executive in commercial lending is acquired by APA's principal lender). Situations in the first category are strictly prohibited. Situations in the second category should be disclosed immediately to the Board of Directors for a determination on procedures to avoid impairment of independent judgment on behalf of APA.

If you have concerns about any situation, follow the steps outlined in the
Section on "Reporting Violations."

ACCURATE PUBLIC DISCLOSURES
Full, fair, accurate, timely and understandable disclosures in APA's periodic reports and press releases is legally required and is essential to the success of our business. You are required to exercise the highest standard of care in preparing such APA public disclosures. The following guidelines are intended to be instructive but are not comprehensive:

- All APA accounting records, as well as reports produced from those records, must comply with applicable laws, regulations, and industry standards.

- All records, including accounting records, must fairly and accurately reflect the transactions or occurrences to which they relate.

- All accounting records must fairly and accurately reflect, in reasonable detail, APA's assets, liabilities, revenues and expenses.

- APA's accounting records must not contain any false or intentionally misleading entries.


- All transactions must be supported by accurate documentation in reasonable detail and recorded in the proper account and in the proper accounting period.

- No information should be concealed from the independent auditors.

COMPLIANCE
You are expected to comply with both the letter and spirit of all applicable governmental laws, rules and regulations.

If you fail to comply with this Code, with APA's Code of Business Conduct and Ethics, and/or with any applicable laws, you will be subject to disciplinary measures, up to and including immediate discharge from APA.

REPORTING VIOLATIONS
Your conduct can reinforce an ethical atmosphere and positively influence the conduct of fellow associates. If you are powerless to stop suspected misconduct or discover it after it has occurred, you must report it to the appropriate level of management at your location.

If you are still concerned after speaking with your local management or feel uncomfortable speaking with them (for whatever reason), you must (anonymously, if you wish) send a detailed note, with relevant documents, to APA, 2950 NE 84th Lane, Blaine, MN 55449 or you may directly contact the Audit Committee of APA's Board of Directors by sending a detailed note, with relevant documents, to Chair of the Audit Committee at the above address or by email to the following email address: auditapa@aol.com

Your calls, detailed notes and/or e-mails will be dealt with confidentially. You have the commitment of APA and of the Audit Committee of APA's Board of Directors that you will be protected from retaliation.

Retaliation by anyone against any reporting person will not be tolerated.

CHANGES AND WAIVERS
In accordance with the rules of the U.S. Securities and Exchange Commission, any change to, or waiver of, this Code must be immediately publicly disclosed.

CONCLUSION
In the final analysis, there are no universal rules or easy answers. Ask yourself whether your actions could be questioned by supervisors, associates, clients, family and the general public. If you are uncomfortable with your answer, discuss the situation with the Audit Committee (See Reporting Violations) before proceeding.

APA Optics, Inc.
2950 NE 84th Lane
Blaine, MN 55449
(763) 784-4995


Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We have issued our report dated June 15, 2004, accompanying the financial statements included in the Annual Report of APA Optics, Inc. on Form 10-K for the year ended March 31, 2004. We hereby consent to the incorporation by reference of said report in the Registration Statements of APA Optics, Inc. on Forms S-8 (File No. 333-74214, effective November 30, 2001; File No. 333-44500, effective August 25, 2000; File No. 333-44488, effective August 25, 2000; and File No. 333-44486, effective August 25, 2000).

/s/GRANT  THORNTON  LLP


Minneapolis,  Minnesota
June  29,  2004


Exhibit 31.1

CERTIFICATION

I, Anil K. Jain, certify that:

1. I have reviewed this annual report on Form 10-K of APA Optics, Inc.;

2. Based on my knowledge, this annual report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this annual report;

3. Based on my knowledge, the financial statements, and other financial information included in this annual report, fairly represent in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this annual report;

4. APA Optics, Inc.'s other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a and 15(e)) for APA Optics, Inc. and we have:

a) Designed such disclosure controls and procedures to ensure that material information relating to APA Optics, Inc., including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this annual report is being prepared;

b) Evaluated the effectiveness of our disclosure controls and procedures as of a date and presented in this annual report our conclusions about the effectiveness of the disclosure controls and procedures based on our evaluation.

c) Disclosed in this report any change in APA Optics, Inc.'s internal control financial reporting that occurred during the most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the Company's control over financial reporting.

5. APA Optics, Inc.'s other certifying officers and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to our auditors and the audit committee of our board of directors:

a) All significant deficiencies and material weaknesses in the design or operation of internal controls over financial reporting which are reasonably likely to adversely affect APA Optics, Inc.'s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal controls over financial reporting.

June 29, 2004

Signature:  /s/  Anil K. Jain
            -----------------
Print Name:  Anil K. Jain
             ------------
Print Title:  Chief Executive Officer and Chief Financial Officer
              ---------------------------------------------------


Exhibit 32.1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO SECTION 906
OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of APA Optics, Inc. (the "Company") on Form 10-K for the period ending March 31, 2004, as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, Anil K. Jain, Chief Executive Officer and Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Sec. 1350, as adopted pursuant to Sec. 906 of the Sarbanes-Oxley Act of 2002, to the best of my knowledge that:

1. The Report fully complies with the requirements of Sections 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly represents, in all material respects, the financial condition and results of operations of the Company.

Signature:  /s/  Anil  K.  Jain
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Print  Name:  Anil  K.  Jain
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Print  Title:  Chief  Executive  Officer  and  Chief  Financial  Officer
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