Document:

EXHIBIT 10.18

                            ASSIGNMENT OF INVENTIONS

            WHEREAS, STANLEY E. ORDER, MD, PC d/b/a CENTER FOR MOLECULAR
MEDICINE, a New York professional corporation with an address of 700 Stewart
Avenue, Garden City, NY 11530, has acquired via assignment from Dr. Wayne S.
Court, all right, title and interest in and to, two certain new and useful
inventions in:

            (1)   RADIOACTIVE PLATINUM COMPLEXES FOR TREATMENT OF MALIGNANT
                  TUMORS; and

            (2)   RADIOACTIVE PLATINUM COMPLEXES FOR CANCER TREATMENT;

which were the subject of two provisional applications for Letters Patent of the
United States based thereon filed in the United States Patent and Trademark
Office on June 25, 2001.

            WHEREAS, ISOTOPE SOLUTIONS, INC. is desirous of acquiring the entire
right, title and interest in and to the inventions and all improvements thereon
which may be made, conceived or acquired by STANLEY E. ORDER, MD, PC d/b/a
CENTER FOR MOLECULAR MEDICINE, and for one year thereafter, in and throughout
the United States, its territories and all countries foreign thereto, and in and
to said applications for Letters Patent and in and to any and all Letters Patent
of the United States and all countries foreign thereto which have been granted
or may be granted on said inventions or any part thereof, or any improvements
thereon.

            NOW, THEREFORE, IN CONSIDERATION of the sum of One Dollar ($1.00),
and other good and valuable consideration, the receipt of which is hereby
acknowledged, STANLEY E. ORDER, MD, PC d/b/a CENTER FOR MOLECULAR MEDICINE, by
these presents do sell, assign and transfer unto ISOTOPE SOLUTIONS, INC., its
entire right, title and interest in and throughout the United States, its
territories and all countries foreign thereto in and to said inventions

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and any improvements thereon which may be made, conceived or acquired by STANLEY
E. ORDER, MD, PC d/b/a CENTER FOR MOLECULAR MEDICINE, during the course of its
association with ISOTOPE SOLUTIONS, INC. and for one year thereafter, in and to
said applications for Letters Patent and any and all Letters Patent and
extensions thereof of the United States and countries foreign thereto which have
been or may be granted on said inventions or any part thereof, or any
improvements thereon or on said application, or any divisional, continuing,
renewal, reissue, or other application and all international priority rights
associated therewith, based in whole or in part thereon, or based upon said
inventions, or any improvements thereon;

            TO BE HELD AND ENJOYED by ISOTOPE SOLUTIONS, INC., and its legal
representatives and assigns to the full ends of the terms for which said Letters
Patent, or any of them, have been granted or may be granted as fully and
entirely as the same would have been held and enjoyed by STANLEY E. ORDER, MD,
PC d/b/a CENTER FOR MOLECULAR MEDICINE, had no sale and assignment of said
interest been made; and STANLEY E. ORDER, MD, PC d/b/a CENTER FOR MOLECULAR
MEDICINE, do hereby authorize and request the Commissioner of Patents and
Trademarks to issue any and all Letters Patent which may be granted upon the
said inventions above referred to, or any of them, or upon said inventions or
any part thereof, or upon any improvements thereon which may be made, conceived
or acquired by STANLEY E. ORDER, MD, PC d/b/a CENTER FOR MOLECULAR MEDICINE,
during the course of its association with the said company and for one year
thereafter, to said ISOTOPE SOLUTIONS, INC., and it hereby agrees for itself,
its successors and assigns, to execute without further consideration, any
further legal documents and any further assignments and any releases, reissues,
renewals or other applications for Letters Patent that may be deemed necessary
by the Assignee herein named, fully to secure to the said Assignee its interest
as aforesaid in and to said inventions or any part thereof or any

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improvements thereon, and in and to said several Letters Patent, or any of them.

            STANLEY E. ORDER, MD, PC d/b/a CENTER FOR MOLECULAR MEDICINE, does
hereby covenant for itself and its legal representatives, and agree with ISOTOPE
SOLUTIONS, INC., and its legal representatives, that STANLEY E. ORDER, MD, PC,
d/b/a CENTER FOR MOLECULAR MEDICINE, has granted no license to make or sell the
said inventions, that prior to the execution of this deed its right, title and
interest in the said inventions has not been encumbered, that it then had good
right and title in and to the inventions and that it has not executed and will
not execute any instrument in conflict therewith.

            IN WITNESS WHEREOF, an authorized representative of STANLEY E.
ORDER, MD, PC d/b/a CENTER FOR MOLECULAR MEDICINE, has hereunto affixed its hand
and seal this 29th day of June, 2001.

                                        STANLEY E. ORDER, MD, PC
                                        d/b/a CENTER FOR MOLECULAR MEDICINE

                                        By: /s/ STANLEY E. ORDER
                                            ------------------------------------
                                            Stanley E. Order, MD

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STATE  OF NEW YORK                  :
                                    : SS:
COUNTY OF NASSAU                    :

            Before me personally appeared Stanley E. Order, MD, an authorized
representative of STANLEY E. ORDER, MD, PC d/b/a CENTER FOR MOLECULAR MEDICINE
and acknowledged the foregoing instrument to be his free act and deed, this 29th
day of June, 2001.

                                        /s/ Shraga D. Aranoff             (SEAL)
                                        ----------------------------------------
                                                     Notary Public

                                                       SHRAGA D. ARANOFF
                                                Notary Public, State of New York
                                                        No. 02AR5047184
                                                   Qualified in Queens County
                                                Commission Expires July 31, 2001

                                       4<PAGE>

                                                                   EXHIBIT 10.17

                         FULL-RECOURSE PROMISSORY NOTE

Loan Amount: $20,000
Interest Rate: 4.83% per year
Date of Loan: April 11, 2001

     FOR VALUE RECEIVED, the undersigned Borrower promises to pay to Tvia, Inc.
("Lender"), at its principal offices at 4001 Burton Drive, Santa Clara,
California, 95054, the principal sum of $20,000 upon the terms and conditions
set forth below.

1.   Term. The entire principal balance of this Promissory Note (this "Note"),
     together with all accrued and unpaid interest thereon, shall be due and
     payable on or at anytime before December 31, 2001.

2.   Interest. Interest on the outstanding principal balance hereunder shall
     accrue at the rate of 4.83% per year, compounded monthly.

3.   Prepayment. Prepayment of principal and interest may be made at any time
     without penalty.

4.   Purpose of Note. The Borrower acknowledges that the purpose of the loan
     evidenced by this Note is to provide funds for the Borrower to pay the
     taxes incurred upon the Borrower's purchase of common stock of the Lender
     pursuant to the terms of one or more Notices of Exercise and Stock Option
     Agreement(s) between the parties (the "Stock Option Agreement").

5.   Security. Payment of this Note is secured by a Pledge and Security
     Agreement which is attached to this Note as Exhibit A and which is hereby
     incorporated by reference. The Borrower, however, shall remain personally
     liable for payment of this Note, and assets of the Borrower, in addition to
     the collateral under the Pledge and Security Agreement, may be applied to
     the satisfaction of the Borrower's obligations under this Note.

6.   Acceleration of Due Date: The entire unpaid principal balance of this Note,
     together with all accrued and unpaid interest thereon, shall, at the
     election of Lender, become immediately due and payable upon the occurrence
     of any of the following, irrespective of the payment date set forth in
     Paragraph 1 of this Note:

     (a)  The failure of the Borrower to pay when due the principal balance and
          interest on this Note and the continuation of such default for more
          than 30 days.

     (b)  Any failure on the part of Borrower to perform or observe any of his
          or her obligations under the Pledge and Security Agreement or any
          other security instrument which secures this Note, as and when
          performance is due.

     (c)  On such date as Borrower ceases to be employed by the Lender.

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     (d)  If at any time Borrower shall admit in writing his or her inability to
          pay debts as they become due, or shall make any assignment for the
          benefit of any creditors, or shall file a petition seeking any
          reorganization, arrangement, composition, readjustment or similar
          release under any present or future statute, law or regulation, or on
          the filing or commencement of any petition, action, case or
          proceeding, voluntary or involuntary, under any state or federal law
          regarding bankruptcy or insolvency.

7.   Collection Costs Borne by Borrower. If action is instituted to collect this
     Note, the Borrower agrees to pay all costs and expenses, including without
     limitation reasonable attorneys' fees, incurred in connection with such
     action.

8.   Waiver. No delay or omission on the part of Lender in exercising any right
     under this Note or under the Pledge and Security Agreement or any other
     security agreement given to secure this Note shall operate as a waiver of
     such right or of any other right under this Note. Any waiver of any term of
     this Note, the Pledge and Security Agreement or of any of the obligations
     secured thereby must be made in writing and signed by a duly authorized
     officer of the Lender. Borrower hereby waives presentment for payment,
     demand, notice of demand and of dishonor and nonpayment of this Note,
     notice of intention to accelerate the maturity of this Note, protest and
     notice of protest, diligence in collecting, and the bringing of suit
     against any other party.

9.   Maximum Interest Payable. All agreements between the Borrower and the
     Lender, whether now existing or subsequently arising and whether written or
     oral, are limited so that in no contingency, whether by reason of
     acceleration of the maturity of the Note or otherwise, shall the interest
     contracted for, charged, received, paid or agreed to be paid to the Lender
     exceed the maximum amount permissible under applicable law. If, for any
     reason, interest would otherwise be payable to the Lender in excess of the
     maximum lawful amount, the interest payable to Lender shall be reduced to
     the maximum amount permitted under applicable law; and if for any reason
     the Lender shall ever receive anything of value deemed interest by
     applicable law in excess of the maximum lawful amount, an amount equal to
     any excessive interest shall be applied to the reduction of the principal
     under this Note and not to the payment of interest, or if such excessive
     interest exceeds the unpaid balance of principal under the Note, such
     excess shall be refunded to the Borrower. All interest paid or agreed to be
     paid to the Lender shall, to the extent permitted by applicable law, be
     amortized, prorated, allocated, and spread throughout the full period until
     payment in full of the principal (including the period of any renewal or
     extension) so that the interest for such full period shall not exceed the
     maximum amount permitted by applicable law. This paragraph shall control
     all agreements between the Borrower and the Lender.

10.  Conflicting Agreements. In the event of any inconsistencies between the
     terms of this Note and the terms of any other document related to the loan
     evidenced by the Note, the terms of this Note shall prevail.

11.  Governing Law. The Note shall be governed by the laws of the State of
     California and shall be construed in accordance with such laws,
     irrespective of its choice of law principles.

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Borrower's Printed Name:   JACK GUEDJ
                         --------------

Borrower's Signature:    /S/ JACK GUEDJ
                         --------------

LENDER: TVIA, INC.

By /S/ Michael Hoberg
   ------------------------------

Its             VP-CFO
   ------------------------------

     I, Patricia Guedj, the spouse of Borrower, do hereby consent to the
borrowing by the Borrower of the loan evidenced by this Note on the terms and
conditions set forth in this Note and to pledge of stock under the Pledge and
Security Agreement (attached to this Note as Exhibit B) and any extensions,
modifications or amendments thereto, as security for the obligations of the
Borrower under this Note.

/S/ Patricia Guedj
---------------------------------
       Spouse's Signature

                                       -3-

<PAGE>

                                   EXHIBIT A

                         PLEDGE AND SECURITY AGREEMENT

     THIS PLEDGE AND SECURITY AGREEMENT is made as of April 11, 2001, between
the Borrower and Tvia, Inc. (the "Corporation").

     WHEREAS, the Corporation has loaned to the Borrower the sum of $20,000
which Borrower has used to pay taxes on the purchase of shares of common stock
of the Corporation pursuant to the terms of one or more Notices of Exercise and
Stock Option Agreement(s) between the parties (the "Stock"), and Borrower has
signed a promissory note (the "Note"); and

     WHEREAS, the Borrower has agreed to pledge the Stock with the Corporation
as security for the payment of the Note.

     NOW, THEREFORE, the parties agree as follows:

1.   The Borrower delivers the Corporation certificates for the Stock, together
     with two Assignments Separate from Certificate (attached as Exhibit B)
     signed by the Borrower. The Borrower pledges the Stock as security for the
     payment of the Note. In the event of default in payment of the Note, the
     Borrower appoints the Corporation as the Borrower's true and lawful
     attorney to take such action as may be necessary or appropriate to cause
     the Stock to be transferred into the name of the Corporation, or to any
     Borrower of the Stock.

2.   The Corporation agrees to hold the Stock as security for the payment of the
     Note and interest under the Note, and the Corporation shall not at any time
     dispose of or encumber the Stock except as otherwise in this Agreement.

3.   At all times while the Corporation is holding the Stock as security, the
     Corporation shall (a) collect all dividends declared on the Stock and shall
     credit such dividends against principal and interest of the Note, as part
     payment, and (b) collect and hold any other securities and/or other
     property distributed on account of the Stock, all of which shall be pledged
     to the Corporation under this Agreement.

4.   While the Corporation holds the Stock as security under this agreement, the
     Borrower shall have the right to vote the Stock at all meetings of the
     stockholders of the Corporation, so long as the Borrower is not in default
     in the performance of any of the terms of this Agreement, or in the
     payments due under the Note.

5.   Upon repayment of the balance of the Note and all interest and other
     charges due, the Corporation shall deliver to the Borrower the certificates
     for the Stock, and the Assignment forms, provided that if at such time any
     of the shares of Stock are subject to a Repurchase Option in favor of the
     Corporation pursuant to an applicable common stock purchase agreement or
     stock option agreement, then in such event the Corporation shall deliver
     such certificate to the escrow agent.

6.   In the event the Borrower fails to perform any of the terms of this
     Agreement, or fails to make payments when due under the Note as required,
     the Corporation shall have all the

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     rights and remedies of a creditor and secured party at law and in equity,
     including the rights and remedies provided under the California Uniform
     Commercial Code, and without limiting the foregoing, the Corporation may,
     after then days' prior written notice to the Borrower by certified mail at
     the Borrower's residence or business address, sell any or all of the Stock
     in such manner and for such price as the Corporation may determine. Out of
     the proceeds of such sale, the Corporation may retain an amount sufficient
     to pay the principal and interest then due on the Note, together with
     expenses of the sale and reasonable attorneys' fees, and the Corporation
     shall pay the balance of the proceeds, if any, to the Borrower. At any bona
     fide sale, which qualifies as a public sale under the California Uniform
     Commercial Code, the Corporation may (if the Corporation is the highest
     bidder) purchase all or any part of the Stock at such price as the
     Corporation deems proper. Borrower shall be liable for any deficiency
     remaining following exercise by the Corporation of its rights under this
     agreement.

7.   Provided the Borrower has not failed to perform on a timely basis any of
     the Borrower's obligations under the Note or this agreement, the
     Corporation will release the Stock from pledge upon payment in full of the
     Note plus all accrued but unpaid interest, subject to the terms of any
     applicable common stock purchase agreement or stock option agreement.

8.   This Agreement shall be governed by and construed in accordance with the
     laws of the State of California without regard to its choice of law
     principles.

                                      A-2

<PAGE>

                                   EXHIBIT B

                      ASSIGNMENT SEPARATE FROM CERTIFICATE

     FOR VALUE RECEIVED __________________________________ hereby sells, assigns
and transfers unto _______________________________________ (______) shares of
the Common Stock of ______________________________________________________ (the
"Company"), standing in _______________________ name on the books of the Company
represented by Certificate No. _________________ herewith and hereby irrevocably
constitutes and appoints ____________________________________________ Attorney
to transfer the Stock on the books of the Company with full power of
substitution in the premises.

     Dated: _______________, _____.

                                                  /S/ JACK GUEDJ
                                        _______________________________________
                                        Purchaser's Signature

INSTRUCTIONS: PLEASE DO NOT FILL IN ANY BLANKS OTHER THAN THE SIGNATURE LINE.
THE PURPOSE OF THIS ASSIGNMENT IS TO ENABLE THE COMPANY TO EXERCISE ITS
"REPURCHASE OPTION" SET FORTH IN THE STOCK PURCHASE OR STOCK OPTION AGREEMENT
WITHOUT REQUIRING ADDITIONAL SIGNATURES ON THE PART OF PURCHASER.

                                      B-1

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