Document:

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                                  Exhibit 10.12

                                 PROMISSORY NOTE

Principal Amount: $500,000                     Date of Note:   December 30, 2003

         FOR VALUE RECEIVED, the undersigned, SulphCo, Inc., a Nevada
corporation ("Borrower"), promises to pay in lawful money of the United States
of America to the order of Rudolf W. Gunnerman and Doris Gunnerman
(collectively, "Lender"), at such place as Lender may designate in writing from
time to time, the principal sum of Five Hundred Thousand and No/100 Dollars
($500,000.00), with a one time payment of interest payable in the form of Common
Stock of SulphCo, Inc. as set forth below.

1. FUNDING. Notwithstanding that the principal amount of this Note is stated to
be $500,000, the loan shall be funded in two tranches of $250,000 each. The
first $250,000 tranche shall be funded on the date of this Note. The second
$250,000 tranche shall be funded when requested by the Borrower.

2. INTEREST. Interest for the one year period commencing on the date of this
Note to the Maturity Date shall be paid by the issuance to Lender or designee of
Five Hundred Thousand (500,000) shares of the Common Stock of SulphCo, Inc. on
or about January 5, 2004, and in no event later than January 15, 2004. As a
condition to the issuance of the 500,000 shares of Common Stock of SulphCo,
Inc., Borrower and Lender shall enter into the form of stock issuance agreement
attached hereto.

3. PAYMENTS AND TERM. The entire indebtedness of funded principal, if not sooner
paid, shall be due and payable in a single payment on December 30, 2004 (the
"Maturity Date"). All payments on account of the indebtedness evidenced by this
Note shall be first applied to any default interest and costs owed under this
Note (if any) and then to principal.

4. PREPAYMENT. The principal indebtedness evidenced by this Note may be prepaid,
in whole or in part, with or without interest, and without payment of a
prepayment fee.

5. DEFAULT. The occurrence of any one or more of the following shall constitute
an event of default under this Note:

         (i)      Failure to make any payment of principal or interest when due;
                  or
         (ii)     The occurrence of any other event of default under this Note
                  following ten (10) days written notice thereof to the
                  Borrower.

            Time is of the essence. If an event of default occurs under this
Note after the passage of applicable cure periods, (i) the entire principal
balance hereof shall, at the option of Lender, without notice, bear interest at
a rate equal to eighteen percent (18%) per annum (or the maximum rate permitted
by applicable law if that is less) from the date of the event of default until
such event of default is cured and (ii) the entire principal balance hereof and
all accrued interest shall immediately become due and payable (or issuable in
the case of stock) at the option of Lender, without notice. Lender's failure to
exercise any option hereunder shall not constitute a waiver of the right to
exercise the same for any subsequent event of default.

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6. COSTS AND ATTORNEYS' FEES. If an event of default occurs under this Note and
Lender consults an attorney regarding the enforcement of any of its rights under
this Note, or if this Note is placed in the hands of an attorney for collection,
or if suit be brought to enforce this Note, Borrower promises to pay all costs
thereof, including attorneys' fees. Said costs and attorneys' fees shall
include, without limitation, costs and attorneys' fees in any appeal or in a
proceeding under any present or future federal bankruptcy act or state
receivership.

7. SECURITY. This Note is unsecured.

8. WAIVER OF PRESENTMENT, ETC. Borrower hereby waives presentment and demand for
payment, notice of dishonor, protest and notice of protest.

9. GOVERNING LAW. This Note shall be construed, enforced and otherwise governed
by the laws of the State of Nevada.

Dated as of the 30th day of December, 2003.

SULPHCO, INC.

By: /s/ Rudolf W. Gunnerman
    --------------------------------
        Dr. Rudolf W. Gunnerman
        Chairman & CEO

By: /s/ Kirk S. Schumacher
    --------------------------------
        Kirk S. Schumacher
        President

                                       2<PAGE>

EXHIBIT 10.13

                                 PROMISSORY NOTE

Principal Amount: $500,000                     Date of Note:   December 30, 2003

         FOR VALUE RECEIVED, the undersigned, SulphCo, Inc., a Nevada
corporation ("Borrower"), promises to pay in lawful money of the United States
of America to the order of Erika Herrmann ("Lender"), at such place as Lender
may designate in writing from time to time, the principal sum of Five Hundred
Thousand and No/100 Dollars ($500,000.00), with a one time payment of interest
payable in the form of Common Stock of SulphCo, Inc. as set forth below.

         1. FUNDING. Notwithstanding that the principal amount of this Note is
stated to be $500,000, the loan shall be funded in two tranches of $250,000
each. The first $250,000 tranche shall be funded on the date of this Note. The
second $250,000 tranche shall be funded when requested by the Borrower.

         2. INTEREST. Interest for the one year period commencing on the date of
this Note to the Maturity Date shall be paid by the issuance to Lender or
designee of Five Hundred Thousand (500,000) shares of the Common Stock of
SulphCo, Inc. on or about January 5, 2004, and in no event later than January
15, 2004. As a condition to the issuance of the 500,000 shares of Common Stock
of SulphCo, Inc., Borrower and Lender shall enter into the form of stock
issuance agreement attached hereto.

         3. PAYMENTS AND TERM. The entire indebtedness of funded principal, if
not sooner paid, shall be due and payable in a single payment on December 30,
2004 (the "Maturity Date"). All payments on account of the indebtedness
evidenced by this Note shall be first applied to any default interest and costs
owed under this Note (if any) and then to principal.

         4. PREPAYMENT. The principal indebtedness evidenced by this Note may be
prepaid, in whole or in part, with or without interest, and without payment of a
prepayment fee.

         5. DEFAULT. The occurrence of any one or more of the following shall
constitute an event of default under this Note:

         (i)      Failure to make any payment of principal or interest when due;
                  or
         (ii)     The occurrence of any other event of default under this Note
                  following ten (10) days written notice thereof to the
                  Borrower.

         Time is of the essence. If an event of default occurs under this Note
after the passage of applicable cure periods, (i) the entire principal balance
hereof shall, at the option of Lender, without notice, bear interest at a rate
equal to eighteen (18%) per annum (or the maximum rate permitted by applicable
law if that is less) from the date of the event of default until such event of
default is cured and (ii) the entire principal balance hereof and all accrued
interest shall immediately become due and payable (or issuable in the case of
stock) at the option of Lender, without notice. Lender's failure to exercise any
option hereunder shall not constitute a waiver of the right to exercise the same
for any subsequent event of default.

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         6. COSTS AND ATTORNEYS' FEES. If an event of default occurs under this
Note and Lender consults an attorney regarding the enforcement of any of its
rights under this Note, or if this Note is placed in the hands of an attorney
for collection, or if suit be brought to enforce this Note, Borrower promises to
pay all costs thereof, including attorneys' fees. Said costs and attorneys' fees
shall include, without limitation, costs and attorneys' fees in any appeal or in
a proceeding under any present or future federal bankruptcy act or state
receivership.

         7. SECURITY. This Note is unsecured.

         8. WAIVER OF PRESENTMENT, ETC. Borrower hereby waives presentment and
demand for payment, notice of dishonor, protest and notice of protest.

         9. GOVERNING LAW. This Note shall be construed, enforced and otherwise
governed by the laws of the State of Nevada.

Dated as of the 30th day of December, 2003.

SULPHCO, INC.

By: /S/ RUDOLF W. GUNNERMAN
    --------------------------
    Dr. Rudolf W. Gunnerman
    Chairman & CEO

By: /S/ KIRK S. SCHUMACHER
    --------------------------
    Kirk S. Schumacher
    President

                                       2<PAGE>

                                  Exhibit 10.14

                            STOCK ISSUANCE AGREEMENT

         This Stock Issuance Agreement is entered into as of December 30, 2003,
by SulphCo, Inc., a Nevada corporation (the "Corporation"), and Erika Herrmann
(the "Lender").

SECTION 1. Issuance of Shares.

         (a) ISSUANCE. On the terms and conditions set forth in that certain
Promissory Note, dated December 30, 2003, the Corporation agreed to borrow from
Lender the sum of Five Hundred Thousand Dollars ($500,000) and, in lieu of
interest payable in cash for a one year period, to pay interest for such one
year period by issuing to Lender, or designee, Five Hundred Thousand (500,000)
shares of the Common Stock of the Corporation (the "Shares"). The Promissory
Note is being made and the Shares are being issued by the Corporation to Erika
Herrmann pursuant to a resolution of the Board of Directors adopted at a meeting
held on December 30, 2003, for the issuance of the Shares. The Shares will be
issued on or about January 5, 2004, but in no event later than January 15, 2004.

         (b) AGREED VALUE OF INTEREST. The Lender and Borrower agree that the
value of the Shares is the last traded closing price of the common stock of the
Corporation on December 26, 2003, being thirty-seven cents ($.37) per share,
discounted by twenty percent (20%) due to the fact of the restrictions on
trading of the Shares and other elements bearing on the value of the Shares,
such that the total agreed value for the Shares is Seventy-Four Thousand Dollars
($74,000.00).

         (c) DEFINED TERMS. Capitalized terms not defined above are defined in
Section 8 of this Agreement.

SECTION 2. Restrictions.

          (a) LENDER REPRESENTATIONS. In connection with the issuance of Shares
under this Agreement, the Lender hereby represents and warrants to the
Corporation as follows:

                  (i) The Lender is acquiring and will hold the Shares for
investment for his or her account only and not with a view to, or for resale in
connection with, any "distribution" thereof within the meaning of the Securities
Act.

                  (ii) The Lender understands that the Shares have not been
registered under the Securities Act by reason of a specific exemption therefrom
and that the Shares must be held indefinitely, unless they are subsequently
registered under the Securities Act or the Lender obtains an opinion of counsel,
in form and substance satisfactory to the Corporation and its counsel, that such
registration is not required. The Lender further acknowledges and understands
that the Corporation is under no obligation to register the Shares.

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                  (iii) The Lender is aware of the adoption of Rule 144 by the
Securities and Exchange Commission under the Securities Act, which permits
limited public resales of securities acquired in a non-public offering, subject
to the satisfaction of certain conditions, including (without limitation) the
availability of certain current public information about the issuer, the resale
occurring only after the holding period required by Rule 144 has been satisfied,
the sale occurring through an unsolicited "broker's transaction," and the amount
of securities being sold during any three-month period not exceeding specified
limitations.

                  (iv) The Lender will not sell, transfer or otherwise dispose
of the Shares in violation of the Securities Act, the Securities Exchange Act of
1934, or the rules promulgated thereunder, including Rule 144 under the
Securities Act. The Lender agrees that he or she will not dispose of the Shares
unless and until he or she has complied with all requirements of this Agreement
applicable to the disposition of Shares and he or she has provided the
Corporation with written assurances, in substance and form satisfactory to the
Corporation, that (A) the proposed disposition does not require registration of
the Shares under the Securities Act or all appropriate action necessary for
compliance with the registration requirements of the Securities Act or with any
exemption from registration available under the Securities Act (including Rule
144) has been taken and (B) the proposed disposition will not result in the
contravention of any transfer restrictions applicable to the Shares under any
"blue sky" laws.

                  (v) The Lender has been furnished with, and has had access to,
such information as he or she considers necessary or appropriate for deciding
whether to invest in the Shares, and the Lender has had an opportunity to ask
questions and receive answers from the Corporation regarding the terms and
conditions of the issuance of the Shares.

                  (vi) The Lender is aware that his or her investment in the
Corporation is a speculative investment that has limited liquidity and is
subject to the risk of complete loss. The Lender is able, without impairing his
or her financial condition, to hold the Shares for an indefinite period and to
suffer a complete loss of his or her investment in the Shares.

         (b) SECURITIES LAW RESTRICTIONS. Regardless of whether the offering and
sale of Shares under this Agreement have been registered under the Securities
Act or have been registered or qualified under the securities laws of any state,
the Corporation at its discretion may impose restrictions upon the sale, pledge
or other transfer of the Shares (including the placement of appropriate legends
on stock certificates or the imposition of stop-transfer instructions) if, in
the judgment of the Corporation, such restrictions are necessary or desirable in
order to achieve compliance with the Securities Act, the securities laws of any
state or any other law.

         (c) RIGHTS OF THE CORPORATION. The Corporation shall not be required to
(i) transfer on its books any Shares that have been sold or transferred in
contravention of this Agreement or (ii) treat as the owner of Shares, or
otherwise to accord voting, dividend or liquidation rights to, any transferee to
whom Shares have been transferred in contravention of this Agreement.

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SECTION 3. Successors and Assigns.

         Except as otherwise expressly provided to the contrary, the provisions
of this Agreement shall inure to the benefit of, and be binding upon, the
Corporation and its successors and assigns and be binding upon the Lender and
the Lender's legal representatives, heirs, legatees, distributees, assigns and
transferees by operation of law, whether or not any such person has become a
party to this Agreement or has agreed in writing to join herein and to be bound
by the terms, conditions and restrictions hereof.

SECTION 4. Legend.

         All certificates evidencing Shares shall bear substantially the
following legend:

                  "THE SHARES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER
                  THE SECURITIES ACT OF 1933, AS AMENDED, AND MAY NOT BE SOLD,
                  PLEDGED, OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE
                  REGISTRATION THEREOF UNDER SUCH ACT OR AN OPINION OF COUNSEL,
                  SATISFACTORY TO THE COMPANY AND ITS COUNSEL, THAT SUCH
                  REGISTRATION IS NOT REQUIRED."

         If required by the authorities of any state in connection with the
issuance of the Shares, the legend or legends required by such state authorities
shall also be endorsed on all such certificates.

SECTION 5. Notices.

         Any notice required by the terms of this Agreement shall be given in
writing and shall be deemed effective upon personal delivery or upon deposit
with the United States Postal Service, by registered or certified mail, with
postage and fees prepaid. Notice shall be addressed to the Corporation at its
principal executive office and to the Lender at the address that he or she most
recently provided to the Corporation.

SECTION 6. Entire Agreement.

         This Agreement constitutes the entire contract between the parties
hereto with regard to the subject matter hereof. It supersedes any other
agreements, representations or understandings (whether oral or written and
whether express or implied) relating to the subject matter hereof.

SECTION 7. Choice of Law.

         This Agreement shall be governed by, and construed in accordance with,
the laws of the State of Nevada, as such laws are applied to contracts entered
into and performed in such State.

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SECTION 8. Definitions.

         (a) "Agreement" shall mean this Stock Issuance Agreement.

         (b) "Board of Directors" shall mean the Board of Directors of the
Corporation, as constituted from time to time.

         (c) "Corporation" shall mean SulphCo, Inc., a Nevada corporation.

         (d) "Shares" shall mean the Shares issued to the Lender pursuant to
this Agreement.

         (e) "Securities Act" shall mean the Securities Act of 1933, as amended.

         (f) "Share" shall mean one share of Stock.

         IN WITNESS WHEREOF, the Corporation and the Lender have executed this
Agreement to be effective as of December 30, 2003.

CORPORATION:                                SULPHCO, INC.

                                             By  /S/ KIRK S. SCHUMACHER
                                                 ----------------------
                                                 Kirk S. Schumacher, President

LENDER:                                          /S/ ERIKA HERRMANN
                                                 ------------------
                                                 Erika Herrmann

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