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                                                                  EXHIBIT 10.18

                         ASSIGNMENT OF SAPIR TECHNOLOGY
                         ------------------------------

         This Assignment Agreement ("Agreement") is effective this 14th day of
September, 1998, and is by and between ITZCHAK SAPIR, a citizen of Israel,
residing at 14 Ganei Binyamina, Binyamina 30 500, Israel ("Sapir") and IMAGEK,
INC., a Delaware corporation, having offices at 3001 Redhill, Building 3, Costa
Mesa, California 92626 ("IMAGEK").

         WHEREAS, pursuant to a License Agreement, effective October 7, 1997,
between Irvine Sensors Corporation ("ISC") and Itzchak Sapir (the "Sapir License
Agreement"), ISC acquired a royalty bearing, exclusive world-wide license under
various U.S. and foreign patents owned by Mr. Sapir relating to digital
photographic products, principally a product which allows an unmodified 35 mm
camera to capture digital images;

         WHEREAS, ISC has assigned its rights under the Sapir License Agreement
to IMAGEK, a subsidiary of ISC, in an Assignment Agreement effective on even
date herewith;

         WHEREAS, Sapir is willing to assign to IMAGEK all rights, title and
interest in and to technology and intellectual property which is the subject of
the Sapir License Agreement and IMAGEK is desirous of receiving such an
assignment from Sapir, subject to terms and conditions provided herein;

         NOW, THEREFORE, in view of the foregoing premises and the mutual
promises between the parties, as well as other good and valuable consideration,
the receipt of which is hereby acknowledged, the parties hereto agree as
follows:

A.       DEFINITIONS:
         ------------

         1. "Intellectual Property" shall mean technical information,
inventions, concepts products, components, confidential information, trade
secrets, know-how, techniques, designs, processes, whether patentable or not,
and all improvements thereto, patents, patent applications, including any
patents issuing thereon and any all divisionals, continuations,
continuations-in-part thereof, and any and all reissues and reexaminations of
any such patents, copyrights, copyright registrations and applications, and all
other related intellectual property rights, now existing or hereinafter created
anywhere in the world.

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         2. "Licensor Patents" shall have the same meaning as the term "Licensor
Patents" in the Sapir License Agreement.

         3. "Technology" shall mean Licensor Patents and all Intellectual
Property relating thereto.

B.       ASSIGNMENT
         ----------

         1.       SAPIR agrees to assign and does hereby assign to IMAGEK the
                  entire right, title, and interest in and to the Technology
                  throughout the world. In exchange for said assignment, IMAGEK
                  agrees to continue making the royalty payments to SAPIR set
                  forth in the Sapir License Agreement.

         2.       SAPIR hereby covenants and agrees that it will communicate to
                  IMAGEK, its successors, legal representatives and assigns, any
                  facts known to it respecting the Technology, and testify in
                  any legal proceeding, sign all lawful papers, execute all
                  provisional, regular, divisional, continuing and reissue
                  applications, make all rightful oaths and generally assist
                  IMAGEK, its successors, legal representatives and assigns, to
                  obtain and enforce proper patent protection for the Technology
                  in all countries. SAPIR hereby appoints IMAGEK as its true and
                  lawful attorney in fact, with full power of substitution in
                  SAPIR's name and stead, but for IMAGEK's benefit, to take any
                  all steps including proceedings at law, in equity or otherwise
                  to execute, acknowledge and deliver any and all instruments
                  and assurances necessary or expedient in order to vest the
                  aforesaid rights in the Technology more effectively in IMAGEK
                  or to protect the same, or to enforce any claim or right of
                  any kind with respect thereto. SAPIR acknowledges that this
                  appointment is coupled with an interest and is irrevocable.

         3.       SAPIR agrees to perform or cause to be performed any further
                  acts and execute and deliver any further documents which may
                  be reasonably necessary or otherwise reasonably required to
                  carry out or give effect and legality to the provisions of
                  this Agreement.

         4.       SAPIR agrees that it will not contest, challenge, or raise any
                  controversy with respect to IMAGEK's rights in the Technology
                  or the validity or enforceability thereof.

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C.       REPRESENTATIONS AND WARRANTIES
         ------------------------------

         1.       SAPIR represents and warrants the following:

                  a.       SAPIR is the sole and exclusive owner of and has full
                           legal power to extend the rights in and to the
                           Technology which are assigned to IMAGEK herein;

                  b.       To the best of its knowledge, the Technology
                           represents a valid invention or valid inventions and
                           any commercial embodiments thereof will not infringe
                           the patent or intellectual rights of any third party;

                  c.       SAPIR has not entered into any contract or other
                           arrangement or made any commitment that may or will
                           impair IMAGEK's rights hereunder and SAPIR agrees
                           that it will not enter into any such contract,
                           arrangement or commitment; and

                  d.       SAPIR has not granted and will not grant any liens,
                           encumbrances or security interests on the rights in
                           and to Technology, and in all respects such rights
                           are free and clear.

D.       INDEMNIFICATION
         ---------------

         SAPIR agrees to indemnify, defend, and hold IMAGEK harmless from any
and all liabilities, claims, obligations, losses, costs, damages, suits,
judgments, and expenses whatsoever, including court costs, expert witness fees,
and attorney's fees, arising from or in any manner connected with: (i) any
inaccuracy in or any breach by SAPIR of any representation or warranty contained
in this Agreement; or (ii) the operation of SAPIR's business as it relates to
this Agreement.

E.       CONFIDENTIAL INFORMATION
         ------------------------

         SAPIR shall keep in trust and confidence all confidential information,
trade secrets, proprietary, know-how, and business information previously,
concurrently or subsequently received from IMAGEK including but not limited to
information pertaining to the prosecution of the patent applications and
enforcement of issued patents and agrees not to disclose the same to third
parties. SAPIR will not recreate, copy, reproduce, use or disclose to others
such information without the written authorization of IMAGEK. These obligations
of confidentiality will not apply to information which becomes public knowledge
through no fault of SAPIR or information which is obtained by SAPIR from a third
party having an unrestricted and legal right to disclose the information to
others.

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F.       MISCELLANEOUS PROVISIOINS
         -------------------------

         1. This Agreement is binding on the parties and their respective
         officers, agents, employees, affiliated companies and heirs.

         2. This Agreement shall be governed and construed in accordance with
         the laws of the state of California, USA without regard to choice of
         law principles, and the parties agree that it is executed and delivered
         in that state.

         3. In the event that any legal action becomes necessary to enforce or
         interpret the terms of this Agreement, the prevailing party shall be
         entitled, in addition to its court costs, to such reasonable attorneys'
         fees, expert witness fees and legal expenses as may be fixed by a court
         of competent jurisdiction.

         4. In the event that any of the provisions or a portion of any such
         provision of this Agreement are held to be unenforceable or invalid by
         a court of competent jurisdiction, the validity and enforceability of
         the enforceable portion of any such provision and the remaining
         provisions of this Agreement shall not be adversely affected.

         5. This Agreement contains the entire understanding and agreement of
         the parties with respect to the subject matter thereof, and there are
         no representations, warranties promises or undertakings other than
         those contained therein. As to the subject matter thereof, this
         Agreement, this Agreement supersedes and cancels all previous
         agreements between the parties thereto.

         6. No course of conduct or dealing between the parties shall act as
         modification or waiver of any provision of this Agreement, and only a
         modification or waiver which is contained in a single writing signed by
         both parties shall be effective.

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              IN WITNESS WHEREOF, the parties hereto have executed this
Agreement in duplicate originals.

                                                ITZCHAK SAPIR

         Dated:     SEP 14, 98                  By:  /S/ I. SAPIR
               ---------------------                ---------------------------
                                                          Signature

                                                Printed Name: Itzhak Sapir
                                                Title: Mechanical Engineer

                                                IMAGEK, INC

         Dated:  As of SEPT. 14,1998            By: /S/  ROBERT WEBBER
               ---------------------                ----------------------------
                                                          Signature

                                                Printed Name: Robert Webber
                                                Title: President & CEO

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                                                                  EXHIBIT 10.19

                      FOURTH AMENDMENT TO LICENSE AGREEMENT
                      -------------------------------------

         THIS FOURTH AMENDMENT TO LICENSE AGREEMENT (the "Fourth Amendment") is
made and entered into as of the 14th day of September, 1998, by and between
IRVINE SENSORS CORPORATION, a Delaware corporation (the "Company"), and ADVANCED
TECHNOLOGY PRODUCTS, LLC, a California limited liability company ("ATP"), with
reference to the following facts:

         A.       The Company and ATP have previously executed a License
                  Agreement dated July 30, 1997 (the "License Agreement") and
                  First, Second and Third Amendments to the Agreement.

         B.       Pursuant to the Third Amendment to the Agreement investors in
                  ATP were offered the opportunity, through their election of
                  Royalty Program "C," to receive a prepayment of their royalty
                  interest in the E-Film product in the form of shares of common
                  stock of Imagek, Inc., a Delaware corporation and subsidiary
                  of the Company ("IMAGEK"), at the exchange rate of 8,500
                  shares of the common stock of IMAGEK, for every $10,000
                  invested in ATP. Pursuant to this exchange offer, ATP, has now
                  received elections representing $1,435,000 of the $1,635,000
                  invested in ATP, entitling these investors to the receipt of
                  1,221,875 shares of common stock of IMAGEK. One investor,
                  representing $200,000 of invested capital in ATP, has elected
                  to remain as a Royalty Program "B" investor and will continue
                  to receive royalty payments for the E-FILM and VIP 20 products
                  as provided for in Section 4.1b of the amended License
                  Agreement. All other investors' rights to receive royalty
                  payments from E-Film sales is hereby terminated as of the
                  closing date of the exchange of their E-Film royalty rights
                  for shares of common stock of IMAGEK.

         C.       The Company and IMAGEK have entered into an Assignment
                  Agreement of even date herewith (the "Assignment Agreement"),
                  wherein the Company has agreed to cause ATP to assign to
                  IMAGEK, all rights, title, and interest in and to the ATPL
                  Technology (as defined in the Assignment Agreement), and ATP
                  has agreed to grant said assignment.

         D.       Upon ATP's execution of an agreement entitled "Assignment of
                  ATPL Technology," IMAGEK will issue 1,221,875 restricted
                  shares of authorized IMAGEK Common Stock to ATP and shall pay
                  to ATP a reduced royalty as provided in this Fourth Amendment.
                  The IMAGEK stock and royalty payments shall be redistributed
                  to investors in ATP in accordance with the provisions of this
                  Fourth Amendment and the Assignment of ATPL Technology.

         E.       The Company and ATP have mutually consented to the termination
                  of the License Agreement and all amendments thereto upon ATP's
                  execution of the Assignment of ATPL Technology.

         NOW, THEREFORE, for the good and valuable consideration, the receipt
         and adequacy of which are hereby acknowledged, the parties hereto do
         hereby agree as follows:

         1.       Section 4.1 of the License Agreement is amended as follows:

                  a. Section 4.1a (Royalty Program "A") is hereby deleted in its
         entirety.

                  b. Section 4.1b (Royalty Program "B") shall remain as stated
         in the Third Amendment to the License Agreement. The parties
         acknowledge that for purposes of calculating royalties due under this
         section that the amount of capital invested by ATP in the Company is
         deemed to be $200,000.

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                  c. Section 4.1c (Royalty Program "C") shall remain as stated
         in the Third Amendment to the License Agreement. The parties
         acknowledge that all investors in this classification have elected to
         have their E-Film royalty rights converted to shares of common stock of
         IMAGEK, but shall continue to be entitled to receive royalty payments
         for VIP 20 sales as stated in the Third Amendment to the License
         Agreement.

         2. Section 5.2 of the Agreement, regarding the right of ATP investors
         to elect to have the Company redeem their interest in ATP with shares
         of restricted common stock of the Company, is amended to provide that
         those Royalty Program "A" investors who have elected Royalty Program
         "C" shall retain 50% of their share redemption rights as granted in
         Section 5.2 of the Licensing Agreement.

         3. ATP agrees to assign all right, title, and interest in and to the
         ATPL Technology to IMAGEK in an agreement which is in substantially the
         same form as the agreement attached as Exhibit "A" to the Assignment
         Agreement (the "Assignment of ATPL Technology").

         4. The company and ATP agree that the License Agreement and all
         amendments thereto shall terminate upon ATP's execution of the
         Assignment of ATPL Technology.

         IN WITNESS WHEREOF, the parties hereto have caused this Fourth
Amendment to the Agreement to be signed as of the date first above written.

                                        IRIVINE SENSORS CORPORATION
                                        a Delaware corporation

         Dated:  9/14/98                By:    /S/ JAMES D. EVERT
               ---------                     -----------------------
                                             James D. Evert, President

                                         ADVANCED TECHNOLOGY PRODUCTS, LLC
                                         a California limited liability company

         Dated:   9-14-98                By:  /S/  JOHN C. CARSON
               ----------                    -----------------------
                                            John C. Carson, Managing Member

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