<PAGE>
 EXHIBIT 10


                                    SALE AGREEMENT


This agreement made this 28th day of June 1996 between Photran Corporation ,
hereinafter referred to as "SELLER" and Wintek Corporation, hereinafter referred
to as "BUYER".

                             W  I  T  N E  S  S  E  T  H

WHEREAS SELLER desires to sell and BUYER desires to purchase an apparatus to be
designated PVAC to be designed, manufactured and assembled by SELLER to the
specification in Appendix A to this agreement.

Now, therefore it is agreed as follows:

1.0 THE EQUIPMENT.  SELLER will design, manufacture and assemble one vacuum
    glass coating system hereinafter designated "PVAC", conforming generally to
    the description set forth in Specification No. 96.001/U as show in Appendix
    A to this agreement.

2.0 PURCHASE PRICE AND PAYMENT TERMS.  The BUYER will pay to SELLER the sum of
    $2,866,500  in payment for the system.  This purchase price shall be paid
    in accordance with the following schedule and on the following terms:  

    A.        US$500,000 on contract signing.

    B.        US$2,000,000 payable upon shipment by irrevocable letter of
              credit.

    C.        US$425,000 payable upon completion of installation and the Final
              Acceptance Test as specified in this agreement by irrevocable
              letter of credit.


3.0 DELIVERY SCHEDULE.  The PVAC system shall be delivered in accordance with
    the following delivery schedule:

    Week Number         Activity                                
    -----------         ----------------------------------------

              1              Contract acceptance

              3              Submission of machine layout drawings for approval

              10             Completion of in-factory assembly

              11-13     In-factory acceptance test

              16             Shipment


Week Number   Activity                                          
-----------   --------------------------------------------------

              19             Commence installation

              21             Complete installation

              23             Final acceptance test


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              25             Commence production

 4.0 TESTING IN SELLER'S PLANT.  Prior to shipment of the PVAC system SELLER
     will conduct such tests of the various components and sub- assemblies as it
     deems necessary to assure that the PVAC system functions properly.  In
     addition the SELLER shall operate the PVAC system on a full production
     basis for a period of four (4) weeks.  During this time the BUYER shall be
     present to monitor the performance of the PVAC system.  The PVAC system
     shall be deemed to have passed this In-factory acceptance test if it
     operates at full production capacity for a minimum of 22 hours out of 24
     hours for six consecutive days.  During this period the aggregate
     production output shall equal a minimum of 90,000 pieces of which at least
     92% or more shall have met the quality standards as specified in Appendix B
     to this agreement.

 5.0 DELIVERY.   SELLER shall purchase insurance and make shipping arrangements
     which have been included in the purchase price paid by BUYER.  SELLER'S
     good faith estimate of the date of shipment is 16 weeks from the date of
     execution of this agreement.  In the event of late delivery BUYER'S sole
     remedy shall be to reduce the purchase price paid to SELLER by the amount
     of 1% for each four week period that the system is shipped late.  In the
     event that the system is shipped more than four weeks late such penalty
     shall be increased to 2% for each four week period or part thereof.  Such
     penalty shall not apply provided SELLER can provide evidence that the cause
     of such delay was due to or arising from, but not limited to, acts of God,
     acts of BUYER, acts of subcontractors including the failure of suppliers of
     materials or components to timely delivery the same or to comply with
     specifications, modifications of design of the apparatus or specifications
     requested by BUYER, acts of civil or military authorities, fires, strikes,
     labor disputes, sabotage, quarantine restrictions, war or riot.  In the
     event of any delay caused by the reasons described above the date of
     delivery shall be extended for a length of time equal to the period of
     delay but in any case not in excess of three months, which period SELLER
     shall use his best efforts to minimize.

 6.0 SCOPE OF WORK TO BE PERFORMED BY THE BUYER.  Buyer will supply
     an appropriate facility located within Taiwan of sufficient size and
     quality to properly accommodate the PVAC system.  This will include
     appropriate foundations, trenches, ceiling heights, floor space, water
     piping, electrical services, compressed air quality and temperatures as
     specified in Appendix A of this agreement.  The BUYER'S facility shall have
     the appropriate cooling water, compressed air, electrical power, sputter
     gases, city water and de-ionized water, material handling, cranage and such
     other services as identified by SELLER in the Specification Appendix A of
     this agreement needed to enable the PVAC system to be properly installed
     and tested.  Further, BUYER shall be responsible for providing facility
     drawings to accurately reflect the position where the PVAC system is to be
     installed.

     To enable the Seller to perform the scope of work outlined in Section 7.0
     the BUYER will be responsible for performing the following work:

      1.0  Provide skilled project engineer to coordinate site preparation work
           with Seller.  This person shall be responsible for providing accurate
           drawings and answering all questions concerning availability of
           utilities and other needed facilities to assist Seller in the
           installation of the equipment.

      2.0  Provide machine unloading upon arrival at Buyer's facility.

      3.0  Provide skilled personnel for uncrating, moving and installation of
           the PVAC system and supporting equipment in its permanent location.

      4.0  Provide required electrical service supply and distribution.

      5.0  Provide appropriate cooling water and clean dry air supply.


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      6.0  Provide skilled electricians for making electrical connections from
           electrical supply switch gear to power supplies, control panels, 
           motor control centers, washing machines, conveyors, clean rooms, and
           inspection stations.

      7.0  Provide skilled mechanical tradesman for installing air, water and
           vacuum piping to the PVAC system.

      8.0  Provide appropriate technical personnel to be trained in the 
           operation and maintenance of the PVAC system.

      9.0  Arrange for all required permits and approvals to facilitate 
           equipment installation.

     10.0  Provide any needed foundations, cable trenches or water supply 
           piping.

     11.0  Provide process gas supply and piping.

     12.0  Provide City and DI water supply and piping.

     13.0  Provide all consumable materials and supplies needed to test machine.

     14.0  Provide glass racks for storing and transporting raw, in-process and
           finished glass.

7.0  SCOPE OF WORK TO BE PERFORMED BY SELLER.  BUYER shall notify SELLER
     immediately upon arrival of the PVAC system at the BUYER'S plant.  SELLER
     shall be responsible for supplying skilled personnel to supervise the
     installation of the PVAC system in the BUYERS facility.  

     Seller will perform the following scope of work in the supply of the PVAC
     system:

     1.0   Supply PVAC system in accordance with this specification.

     2.0   Perform a full operational test of the PVAC system for a period of 30
           days in the Seller's facility in accordance with the terms of the
           Sales Agreement.  

     3.0   Arrange export crating and shipping to Buyer's facility.

     4.0   Provide supervision of the installation of the system in the Buyers
           facility.

     5.0   Perform the acceptance test as specified in the Sales Agreement in
           Buyer's facility.

     6.0   Provide comprehensive training program for Buyer's personnel.

     7.0   Assist Buyer in pilot scale-up of production for a period of one 
           month after the machine has passed acceptance tests.  Additional 
           technical assistance for a period of up to three months available 
           at Buyer's expense.

     Work to be performed by Seller will be done in a professional and workman
     like manner.  Work will be performed in accordance with the delivery and
     installation schedule per Section 3.0 of this agreement.

     To the extent that the installation requires a coordination of work between
     the SELLER and BUYER the SELLER shall have authority to direct BUYER'S
     personnel in the proper techniques and methods for completing the
     installation of the machine in a timely manner.  BUYER shall be responsible
     for providing access for up to sixteen hours per day to the BUYER'S
     facility to facilitate the efficient installation of the PVAC system.  

     Each party shall be responsible for any delays which it causes which result
     in an inability to proceed in an efficient manner with the installation of
     the PVAC system.  To the extent that such 


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     delays are caused by the SELLER but are remedied in such a manner that the
     overall  delivery and installation schedule is not changed SELLER shall
     have no further liability to the BUYER.  To the extent that such delays
     caused by SELLER result in a delay in the installation schedule as
     specified in Section 3.0 of this agreement, SELLER shall be liable for a
     penalty of up to $1000.00 per working day for each day of such delay.  To
     the extent that such delays are caused by actions of the BUYER but  do not
     result in a delay in the overall completion of the installation and
     acceptance testing of the PVAC, BUYER shall have no obligation to the
     SELLER.  To the extent that such delays caused by BUYER do result in a
     delay in the installation of the machine BUYER shall be liable to pay
     SELLER the sum of $1000.00 for each working day of delay caused by the
     BUYER'S actions.

8.0  FINAL ACCEPTANCE TEST.  Upon completion of the installation of the PVAC
     system SELLER shall notify BUYER that the system is ready for the Final
     Acceptance test.  SELLER shall demonstrate the operation of the PVAC system
     for a period of 22 hours out of 24 hours for six consecutive days.  The
     PVAC system will be deemed to have passed the Final Acceptance Test if it
     operates in at full production capacity for an aggregate of 125 hours
     during the six day test period and further if the aggregate production
     output equals a minimum of 90,000 pieces of ITO coated glass which meets
     the specification in Appendix B of this agreement.  The acceptable output
     quantity and production yield will be reduced be the number of defective
     pieces attributable to defects in materials or due to defects caused by
     Buyers cleaning or handling equipment or personnel.  Upon successful
     completion of the acceptance test by SELLER the BUYER shall sign the
     acceptance affidavit acknowledging acceptance of the machine and the
     corresponding liability for final payment.

9.0  WARRANTY.  SELLER warrants that the PVAC system will comply with the
     specifications set forth in the Specification in Appendix A to this
     agreement.  SELLER further warrants that for a period of twelve months from
     the date of acceptance of the PVAC system it will be free from functional
     defects in materials and workmanship.  This warranty is subject to the
     limitation that the PVAC system and its components are operated in
     accordance with the SELLER'S recommendations and that regular periodic
     maintenance and service is performed and that appropriate consumable
     replacement parts are installed in accordance with instructions provided by
     SELLER.

     This warranty shall not apply to any components or parts which have been
     repaired or replaced by other than SELLER or SELLER'S representative or as
     a result of written notification from SELLER for such alterations.  This
     warranty does not apply to disposable parts normally requiring periodic
     replacement.

     The BUYER'S sole and exclusive remedy under the above warranty is limited
     to the repair or replacement of defective parts by the SELLER or the
     SELLER'S representative.  This warranty shall only apply if the defect has
     been properly reported to the SELLER, and if so advised by the SELLER the
     BUYER returns the part or component to the SELLER within twenty-one days
     after such notification.  The SELLER shall be responsible for promptly
     repairing or replacing any defective item and for paying the cost of
     transportation charges to and from the BUYER.  Prior to shipment of any
     defective or damaged component BUYER will be responsible for obtaining
     return authorization from the SELLER.  

10.0 LIMITATION OF LIABILITY.  SELLER'S liability shall be limited solely to its
     responsibilities under the warranty as set forth in Section 9 above and
     further to the remedy for late delivery as set forth in Section 3.  IN NO 
     EVENT SHALL THE SELLER BE LIABLE FOR INDIRECT, SPECIAL, INCIDENTAL OR
     CONSEQUENTIAL DAMAGES ARISING FROM ANY SOURCE SUCH AS, BUT NOT LIMITED TO,
     THE MANUFACTURE, USE, DELIVERY, INCLUDING LATE DELIVERY, OR TRANSPORTATION
     OF THE PVAC SYSTEM, ITS PARTS OR COMPONENTS WHETHER SUCH DAMAGES ARE CAUSED
     BY THE SELLER'S NEGLIGENCE OR OTHERWISE, PROVIDED HOWEVER THAT SELLER SHALL
     BE RESPONSIBLE FOR ITS INTENTIONAL MISCONDUCT AND GROSS NEGLIGENCE. 
     FURTHER SELLER SHALL NOT BE LIABLE FOR COST OF CAPITAL, COST OF SUBSTITUTE
     EQUIPMENT TO THE PVAC SYSTEM, COST OF SERVICES,


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     REPAIRS, COMPONENTS OR PARTS, LOSS OF PROFIT OR REVENUE, COST OF ELECTRICAL
     POWER OR UTILITIES WHETHER PURCHASED OR PRODUCED BY THE BUYER, LOSS OF USE
     OF THE PVAC SYSTEM OR ANY PART THEREOF  OR ANY OTHER PROPERTY OWNED BY THE
     SELLER.  SELLER SHALL NOT BE LIABLE FOR CLAIMS OR COSTS OF BUYER'S
     CUSTOMERS OR DAMAGES TO ANY PROPERTY.  IN ANY EVENT THE MAXIMUM LIABILITY
     FOR WHICH THE SELLER CAN BE HELD LIABLE SHALL BE LIMITED TO THE AMOUNT PAID
     BY THE BUYER FOR THE PVAC SYSTEM.

11.0 RESOLUTION OF DISPUTES.  Any dispute or controversy or claim relating to
     any matter within this agreement which cannot be resolved amicably by the
     parties within twenty-one days after written notice by either party of the
     existence of such dispute shall be settled by arbitration under the rules
     of the American Arbitration Association before a board of three arbitrators
     appointed in accordance with said rules.  Provided, however, that the
     arbitration shall be completed within thirty consecutive days thereof and
     the arbitrator shall have no authority to award damages or to change the
     express terms of this agreement.  The arbitration proceedings shall be held
     at the location chosen by the party against whom the claim or complaint is
     made.  The decision of the arbitrator shall be final and binding upon the
     parties but shall be dispositive only of the issue of whether the PVAC
     system complies with the specifications if such issue is raised before any
     court of competent jurisdiction.

12.0 TRAINING.  Upon completion of the acceptance test and acceptance of the
     PVAC system by the BUYER the SELLER will provide qualified personnel to
     assist BUYER in training of BUYER'S personnel in the operation and
     maintenance of the PVAC system.  Such training shall consist of four weeks
     of on-site training by the SELLER'S personnel.  In no event shall the
     SELLER be responsible for damage to the PVAC system caused by BUYER'S
     personnel during the training and start-up period.

13.0 AFTER INSTALLATION SERVICE.  After the installation has been completed and
     the acceptance and training activity fulfilled SELLER shall provide to
     BUYER appropriate after installation service.  In no event, however, shall
     SELLER be liable or responsible for damage or losses caused by its failure
     to meet its obligations for after-installation service.

14.0 DESIGN CHANGES FROM SPECIFICATION.  The PVAC system will be designed and
     manufactured in accordance with the specification in Appendix A to this
     agreement.  Notwithstanding the SELLER reserves the right to change its
     specifications, drawings and any component to such an extent that it sees
     fit provided, however, that such change will not impair the performance of
     the system or its ability to meet the acceptance test as specified in this
     agreement.  Such changes will be made by the SELLER at its own expense.  If
     the SELLER determines that a change involving a material amount of
     additional expense would provide a significant improvement to the
     performance of the PVAC system it will notify BUYER of the nature of the
     change and the additional time required to implement the change (if any)
     and the price of the change.  BUYER shall have the option to approve the
     change and agree to pay any additional purchase price by executing an
     appropriate amendment to this agreement reflecting the increased price and
     the change in the estimated delivery date. 

15.0 LOCAL GOVERNMENT CODES.  The PVAC system is not designed to meet specific
     requirements of any country, state, province, city, or other governmental
     body.  Specification in Appendix A to this agreement does not specify any
     equipment or approval testing.  BUYER is responsible for carefully
     reviewing the specification and seeking clarification from the SELLER of
     any such matters prior to executing this agreement.  Further the BUYER
     shall have a period of twenty-one days after the execution of this
     agreement to notify the SELLER  of any specific governmental requirements
     which the PVAC system must comply.  SELLER shall have a period of fourteen
     days after receiving such notification to notify BUYER whether such
     requirements can be complied with without additional cost or, if not, what
     the additional cost will be as well as any changes in delivery times which
     such compliance will cause.  BUYER shall have fourteen days upon receipt of
     such notification to accept or reject the additional costs and changed
     delivery caused by such compliance requirements.  If the BUYER accepts such
     additional costs or delivery 


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     delays he shall execute an appropriate amendment to this agreement
     reflecting such.  If the BUYER does not accept such additional costs or
     delivery delays he will notify the SELLER in writing of his desire to
     cancel this contract and to pay a cancellation charge of $50,000.  Such
     cancellation charge to be paid promptly upon receipt of invoice from the
     SELLER.

     Any delays or changes which occur subsequent to such notification will be
     for BUYER'S account.  Any extra costs incurred to meet such requirements
     will be added to the purchase price together with a profit not to exceed
     10% thereof.

16.0 PVAC SYSTEM DOCUMENTATION.  SELLER will deliver to BUYER a preliminary
     operating manual and supporting documentation concerning the operation and
     maintenance of the PVAC system not later than the completion of the
     installation of the system.  Within one month after the acceptance of the
     PVAC system by the BUYER the SELLER will provide the BUYER with final
     documentation concerning the operation and maintenance of the system.

17.0 PATENTS.  SELLER indemnifies the BUYER against any claims by third parties
     related to the infringement of patents rights for any component of the PVAC
     system.  Concurrent with the execution of this agreement BUYER agrees to
     execute the technology license agreement between Photran Corporation and
     the BUYER.  

18.0 ASSIGNMENT.  This agreement may not be assigned by either party without the
     express written consent of the other party.  However this agreement may be
     assigned by either party to any successor who assumes substantially the
     entirety of such party's business.

19.0 CONTRACT IN THE ENTIRETY.  This agreement and the technology license
     agreement constitute the entire contract and understanding between the
     parties concerning all matters related to the sale of the PVAC system and
     the licensing of Photran's technology.  Both parties agree that they have
     not relied upon any other representation or agreement or undertaking not
     expressly set forth in this agreement.  Catalogs, literature, proposals,
     reports and other documentation which the SELLER may have provided to the
     BUYER were provided solely for general information and shall not be deemed
     to modify the provisions of this agreement.

20.0 TAXES AND DUTIES.  It shall be the BUYER'S responsibility to pay any import
     duties or taxes levied related to the purchase of the PVAC system.  Further
     it shall be the BUYER'S responsibility to obtain the appropriate
     governmental approvals for the importation of the PVAC system to the
     Republic of China.

21.0 BUYER'S RESPONSIBILITY TO SELLER'S PERSONNEL.  When SELLER'S personnel are
     present at BUYER'S facility SELLER shall provide such personnel with
     reasonable office space and telephone service.

22.0 LIMITATION OF CLAIMS.  No action or suit shall be brought by either party
     for damages arising out of the purchase, manufacture, use, delivery or
     transportation of the PVAC system whether such suit or action is for breach
     of contract, breach of warranty or otherwise unless such action is
     commenced within twelve months after the cause of action has occurred.

23.0 GOVERNING LAW AND VENUE.  Except as expressly set forth in this agreement
     any action, arbitration or suit relating to this agreement for the PVAC
     system shall be commenced before a court within the jurisdiction in which
     the defendant resides.  This agreement and the rights of the parties shall
     be interpreted and governed by the laws of the State of Minnesota.


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In witness thereof the parties have caused this agreement to be executed by
their duly authorized officers as of the date shown below.

SELLER                               BUYER     

By          /S/ David E. Stevenson   By        /S/ H. Huang
            ----------------------             -------------------------

Name        David E. Stevenson       Name      H. Huang
            ----------------------             -------------------------

Title       President                Title     M.D.
            ----------------------             -------------------------

Date        June 28, 1996            Date      June 28, 1996
            ----------------------             -------------------------


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