Document:

Exhibit 10.16

                              AMENDED AND RESTATED
                           PATENT ASSIGNMENT AGREEMENT

     This Amended and Restated Patent Assignment Agreement is made as of
September 30, 2003, but effective as of July 7, 1998 (the "Effective Date")
between STANLEY ABRAMS ("Stan"), and BRETT ABRAMS ("Brett"), each of whose
principal address is 4871 North Mesa Drive, Castle Rock, Colorado 80104 and
NATHANIEL ENERGY CORPORATION, a Delaware corporation (the "Company"), with its
principal offices at 8001 South Interport Boulevard, Englewood, Colorado 80112.
Stan and Brett are collectively referred to as "Abrams".

     WHEREAS, Stan, Brett and the Company entered into an Agreement dated July
7, 1998 pursuant to which Abrams assigned to the Company certain patents
relating to the thermal combustor.

     WHEREAS, Stan, Brett and the Company desire to amend and restate the
agreement effective as of the Effective Date upon the terms and conditions set
forth herein.

     NOW, THEREFORE, in consideration of the respective agreements and covenants
of the parties set forth herein and for good, valuable and sufficient
consideration, the receipt and sufficiency of which is hereby acknowledged, the
parties hereto agree as follows:

     1. Assignment of Patents.

     (a) Abrams hereby grants, assigns and conveys to the Company all of
Abrams's rights, title and interests in and to all types of exclusionary or
protective rights granted (or applications therefor) for inventions (including,
without limitation, letters patent, utility models, inventor's certificates and
the like), and all reissues and extensions thereof and all renewals, divisions,
continuations and continuations-in-part thereof, recognized under federal law
and all comparable rights recognized in foreign jurisdictions or conventions or
by treaty, including, without limitation, all such rights listed on Schedule A
attached hereto relating to the thermal combuster (collectively, the "Patents").
Schedule A indicates in each case whether the applicable Patent is issued or the
subject of a pending application in the U.S. Patent & Trademark Office and any
foreign jurisdictions.

     (b) Abrams agrees to take all necessary steps to effectuate the assignment
of Patents in the U.S. Patent & Trademark Office and any foreign jurisdictions.

<PAGE>

     2. Reassignment of Patents. In the event (a) neither Stan nor Brett are
employed by the Company as a senior executive and a director, except as a result
of termination for cause, voluntary resignation, death or legal incompetence, or
(b) the Company ceases business operations or (c) an order of relief under the
federal bankruptcy laws is entered against the Company, then, in any such event,
Stan may, and in the event Stan is deceased or legally incompetent, Brett may,
demand in writing, that the Company immediately reassign the Patents to both or
one of the Abramses, as directed by the Abrams making such demand, and the
Company agrees to take all necessary steps to effectuate the reassignment of the
Patents in the U.S. Patent & Trademark Office and any foreign jurisdictions.

     3. Stan and Brett Representations and Warranties. Stan and Brett, jointly
and severally, hereby represent and warrant to the Company as follows, and
acknowledge that the Company is relying on such representations and warranties
in entering into and performing its agreements hereunder.

     (a) He has full power to execute and deliver this Agreement and to perform
his duties and responsibilities contemplated hereby.

     (b) Neither the execution of this Agreement nor performance hereunder will
(i) violate, conflict with or result in a breach of any provisions of, or
constitute a default (or an event which, with notice or lapse of time or both,
would constitute a default) under the terms, conditions or provisions of any
contract, agreement or other instrument or obligation to which he is a party, or
by which he may be bound, or (ii) violate any order, judgment, writ, injunction
or decree applicable to him.

     (c) As of the Effective Date, Abrams is the sole, true and lawful of the
Patents, free and clear of any lien, security agreement or other encumberance of
any kind.

     4. Company Representations and Warranties. The Company hereby represents
and warrants to Abrams as follows, and acknowledges that Abrams is relying on
such representations and warranties in entering into and performing its
agreements hereunder.

     (a) It is a corporation duly organized validly existing and in good
standing under the laws of the state of its incorporation and it has qualified
to do business as a foreign corporation in the jurisdictions, if any, outside of
such state, in which it does business and is required to so qualify.

     (b) It has full corporate power and authority to execute and deliver this
Agreement and to perform the duties and responsibilities contemplated hereby.

     (c) The execution, delivery and performance of this Agreement has been duly
authorized by its Board of Directors, as required, and no other approval are
necessary.

     (d) Neither the execution of this Agreement nor performance hereunder will
(i) violate, conflict with or result in a breach of any provisions of, or
constitute a default (or an event which, with notice or lapse of time or both,
would constitute a default) under the terms, conditions or provisions of its
Certificate of Incorporation or By-laws or any contract, agreement or other
instrument or obligation to which it is a party, or by which it may be bound, or
(ii) violate any order, judgment, writ, injunction or decree applicable to it.

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     5. Entire Agreement. This Agreement constitutes the entire agreement of the
parties with respect to the subject matter hereof. The representations,
warranties, covenants and agreements set forth in this Agreement constitute all
the representations, warranties, covenants and agreements of the parties and
upon which the parties have relied, shall not be deemed waived or otherwise
affected by any investigation made by any party hereto and, except as may be
specifically provided herein, no change, modification, amendment, addition or
termination of this Agreement or any part thereof shall be valid unless in
writing and signed by or on behalf of the party to be charged therewith.

     6. Notices. Any and all notices or other communications or deliveries
required or permitted to be given or made pursuant to any of the provisions of
this Agreement shall be deemed to have been duly given or made for all purposes
when in writing and hand delivered or sent by certified or registered mail,
return receipt requested and postage prepaid, overnight mail, nationally
recognized overnight courier or telecopier to the parties at their respective
addresses set forth above or at such other address as any party may specify by
notice given to the other party in accordance with this Section 6.

     7. Choice of Law; Severability. This Agreement shall be governed by, and
interpreted and construed in accordance with, the laws of the State of Colorado,
excluding choice of law principles thereof. In the event any clause, section or
part of this Agreement shall be held or declared to be void, illegal or invalid
for any reason, all other clauses, sections or parts of this Agreement which can
be effected without such void, illegal or invalid clause, section or part shall
nevertheless continue in full force and effect.

     8. Successors and Assigns; Assignment. This Agreement shall be binding upon
and inure to the benefit of the parties and their respective successors and
assigns; provided, however, that neither party may assign any of its rights or
delegate any of its duties under this Agreement without the prior written
consent of the other party, and further provided hereunder that with respect to
Abrams, this Agreement shall only inure to the benefit of Stan and Brett.

     9. Counterparts. This Agreement may be executed in one or more
counterparts, each of which shall be deemed an original, and all of which taken
together shall constitute one and the same instrument.

     10. Facsimile Signatures. Signatures hereon which are transmitted via
facsimile shall be deemed original signatures.

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<PAGE>

         11. Headings; Gender. The headings, captions and/or use of a particular
gender under sections of this Agreement are for convenience and reference only
and do not in any way modify, interpret or construe the intent of the parties or
affect any of the provisions of this Agreement.

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<PAGE>

     IN WITNESS WHEREOF, the parties have executed, or have caused this
Agreement to be duly executed as of the date first above written.

                                   NATHANIEL ENERGY CORPORATION

                                   By: /s/  George A. Cretecos
                                       -----------------------------------------
                                          (Signature)

                                       George A. Cretecos
                                       -----------------------------------------
                                          (Name and Title)

                                       /s/  Stanley Abrams
                                       -----------------------------------------
                                       STANLEY ABRAMS

                                       /s/  Brett Abrams
                                       -----------------------------------------
                                       BRETT ABRAMS

                                       5Exhibit 10.17

                              CONVERSION AGREEMENT
                              --------------------

        CONVERSION AGREEMENT made as of October 3, 2003 between NATHANIEL ENERGY
CORPORATION, a Delaware corporation (the "Company"), and RICHARD STRAIN
("Strain").

        WHEREAS, the Company is indebted to Strain in the principal amount plus
interest accrued to the date hereof in the aggregate of Ten Million Dollars
($10,000,000) (the "Conversion Amount"), exclusive of indebtedness in the
aggregate amount of $6,892,151.09 which is memorialized in a Loan Agreement and
a Note of even date between the Company and Strain.

        WHEREAS, Strain and the Company desire to convert the Conversion Amount
into shares of common stock, $.001 par value per share, of the Company (the
"Shares") at the rate of twenty cents ($.20) of Conversion Amount into one
Share, or an aggregate of Fifty Million (50,000,000) Shares upon the terms and
conditions set forth herein.

        NOW, THEREFORE, for and in consideration of the mutual representations
and covenants hereinafter set forth, the parties hereto do hereby agree as
follows:

     1. Conversion.

        (a) Strain hereby irrevocably agrees that effective as of the date
hereof, the entire Conversion Amount shall be converted into an aggregate of
Fifty Million (50,000,000) Shares, at the rate of twenty cents ($.20) of
Conversion Amount for one (1) Share, and all indebtedness of the Company to
Strain up to the Conversion Amount shall be irrevocably extinguished and
satisfied in all respects.

        (b) To the extent that the Company does not have sufficient Shares
authorized for issuance to issue all of the Shares in conversion of the
Conversion Amount, Strain shall have the irrevocable right to such number of
Shares, which shall be issued to Strain as promptly as practicable following the
authorization of a sufficient number of Shares to enable the Company to deliver
all of the Shares to Strain, subject to adjustment for stock dividends, forward
or reverse splits, reclassifications, exchanges, substitutes, mergers,
consolidations and all other matters effecting shares of common stock of the
Company, as if such Shares were issued at the time of such event.

     2. Issuance of Shares. The Shares issued and issuable hereunder shall be
issued to NEC Energy, LLC, a New York limited liability company which is a
designee and an affiliate of Strain (the "Strain Designee").

     3. Undertaking by the Company. The Company shall, within one hundred eighty
(180) days, take all corporate action necessary under Delaware law and the
federal securities laws, rules and regulations to seek shareholder approval to
increase the number of authorized Shares to a number which is at least
sufficient for the Company to deliver all of the Shares issuable to the Strain
Designee hereunder.

<PAGE>

     4. Registration Rights. All of the Shares shall have resale registration
rights as set forth in a Registration Rights Agreement of even date between the
Company and Strain and/or the Strain Designee in, or substantially in, a form
mutually acceptable to Strain and/or the Strain Designee.

     5. Representations by Strain.

        5.1 Strain understands and agrees that the Company is relying and may
rely upon the following representations, warranties and acknowledgments made by
Strain individually, and as a principal of the Strain Designee (for the purposes
of this Section 5, Strain and the Strain Designee are each referred to as the
"Subscriber") in entering into this Agreement:

        (a) The Subscriber represents and warrants that the Shares to be
acquired pursuant to the terms hereof are being acquired for Subscriber's own
account, for investment and not for distribution or resale to others. Subscriber
will not sell, assign, transfer, encumber or otherwise dispose of any of such
Shares unless (i) a registration statement under the Securities Act of 1933, as
amended (the "Securities Act") with respect thereto is in effect and the
prospectus included therein meets the requirements of Section 10 of the
Securities Act, or (ii) the Company has received a written opinion of its
counsel that, after an investigation of the relevant facts, such counsel is of
the opinion that such proposed sale, assignment, transfer, encumbrance or
disposition does not require registration under the Securities Act.

        (b) The Subscriber represents that he and (i.e., Strain and the Strain
Designee severally) is an "accredited investor," as such term is defined in Rule
501 of Regulation D promulgated under the Securities Act.

        (c) The Subscriber represents and warrants that he and it alone, or with
his and its purchaser representative, if any, has such knowledge and experience
in financial and business matters that he and it is capable of evaluating the
merits and risks of the acquisition of the Shares contemplated hereby. The
Subscriber will execute and deliver to the Company such documents as the Company
may reasonably request in order to confirm the accuracy of the foregoing.

        (d) The Subscriber hereby represents that he and it has reviewed all of
the Company's reports, registration statements, proxy and for information
statements which the Company has filed with the Securities and Exchange
Commission via the Electronic Data Gathering and Retrieval (EDGAR) system since
October 1, 2002 and he and it has been furnished by the Company with all
information regarding the Company which he had requested or desired to know;
that all documents which could be reasonably provided have been made available
for his and its inspection and review; that he and it has been afforded the
opportunity to ask questions of and receive answers from duly authorized
representatives of the Company concerning the terms and conditions of the
offering, and any additional information which he and it had requested; and that
he has had the opportunity to consult with his own tax or financial advisor
concerning an investment in the Company.

<PAGE>

        (e) The Subscriber understands that the Shares are not being registered
under the Securities Act in part on the ground that the issuance thereof is
exempt under Section 4(2) of the Securities Act as a transaction by an issuer
not involving any public offering and that Company's reliance on such exemption
is predicated in part on the foregoing representations and warranties of the
Subscriber.

        (f) The Subscriber understands that since the Shares are not being
registered under the Securities Act and they may not be sold, assigned,
transferred, encumbered, or disposed of unless they are subsequently registered
thereunder or an exemption from such registration is available. Accordingly, the
following restrictive legend will be placed on any instrument, certificate or
other document evidencing the Shares:

            "The shares represented by this certificate have not
            been registered under the Securities Act of 1933.
            These shares have been acquired for investment and
            not for distribution or resale. They may not be sold,
            assigned, mortgaged, pledged, hypothecated or
            otherwise transferred or disposed of without an
            effective registration statement for such shares
            under the Securities Act of 1933 or an opinion of
            counsel for the Company that registration statement
            is not required under such Act."

     6. Representations by the Company.

        6.1 The Company represents and warrants to Strain as follows:

        (a) The Company is a corporation duly organized, existing and in good
standing under the laws of the State of Delaware and has the corporate power to
conduct its business.

        (b) The execution, delivery and performance of this Agreement
by the Company has been duly approved by the Board of Directors of the Company.

        (c) The Shares, to the extent of the authorized Shares available for
issuance, have been duly and validly authorized and, when issued in accordance
with the terms hereof, will be duly authorized, validly issued, fully paid and
nonassessable. The Shares to be issued pursuant to Section 1(b) hereof, shall,
when authorized and issued, constitute duly authorized, validly issued, fully
paid and non-assessable shares of common stock of the Company.

     7. Miscellaneous.

         7.1 Any notice or other communication given hereunder shall be deemed
sufficient if in writing and hand delivered or sent by first class mail, postage
prepaid, or overnight mail, addressed to the Company, 4871 N. Mesa Drive, Castle
Rock, Colorado 80104, Attention: Stan Abrams, Chief Executive Officer, and to
Strain

<PAGE>

at 329 Manchester Road, Poughkeepsie, New York 12603. Notices shall be deemed to
have been given on the date of mailing, except notices of change of address,
which shall be deemed to have been given when received.

         7.2 This Agreement shall not be changed, modified or amended except by
a writing signed by the party to be charged, and this Agreement may not be
discharged except by performance in accordance with its terms or by a writing
signed by the party to be charged.

         7.3 This Agreement shall be binding upon and inure to the benefit of
the parties hereto and to their respective permitted successors and assigns
including, without limitation, the Strain Designee. This Agreement sets forth
the entire agreement and understanding between the parties as to the subject
matter thereof and merges and supersedes all prior discussions, agreements and
understandings of any and every nature between them.

         7.4 This Agreement and its validity, construction and performance shall
be governed in all respects by the laws of the State of Delaware, applicable to
agreements to be performed wholly within the State of Delaware.

         7.5 This Agreement may be executed in counterparts.

         7.6 Facsimile signatures hereon are deemed to be original signatures.

       Remainder of page intentionally left blank. Signature page follows.

                                        4

<PAGE>

          IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first above written.

                                            /s/  RICHARD STRAIN
                                            -----------------------------------
                                                 RICHARD STRAIN
                                            Social Security No.
                                                               ----------------

                                            NATHANIEL ENERGY CORPORATION

                                            By:  /S/  STAN ABRAMS
                                               --------------------------------
                                            Name:     STAN ABRAMS
                                            Title:    President/ CEO

                                       5

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