Document:

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                                                                   EXHIBIT 10.18

                            INGEN TECHNOLOGIES, INC.

                            STOCK PURCHASE AGREEMENT

THIS STOCK PURCHASE AGREEMENT (The "Agreement") is made and entered into this
15th day of October, 2004; by and between KHOO Yong Sin (the "Purchaser"), a an
Individual representing various investment groups, having its principal
offices/location at No. 21 Upper Weld Road, Singapore 207378, and Ingen
Technologies. Inc. (the "Seller", "Ingen" or the "Company"), a Goergia
corporation, having its corporate headquarters at 285 E. County Line Rd.,
Calimesa CA 92320;

                              W I T N E S S E T H:

     WHEREAS, the Seller has the authority to issue 5,000,000 shares (five
Million shares) of the Company's public common stock that is Registered and
Restricted under SEC Rule-144; and

     WHEREAS, the Seller is in the business of developing, manufacturing,
marketing and selling medical and commercial products; and

     WHEREAS, the Seller is desirous of selling shares of its common stock at
negotiated prices to sophisticated and knowledgeable investors for the purpose
of raising working capital and expanding its business in accordance with its
business plan; and

                                  Page 1 of 11

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     WHEREAS, the Purchaser is representing various investors and interested in
purchasing common shares of the Company's stock in accordance with the terms and
conditions set forth herein,

     WHEREAS, the parties hereto desire to set forth in writing their
understandings and agreements;

NOW, THEREFORE, in consideration of the following premises, representations,
warranties, covenants, and for other good and valuable consideration, the timely
receipt and sufficiency of which are hereby acknowledged, the parties hereto,
intending to be legally bound, agree as follows:

1.   Sale of Shares
     --------------

Pursuant to the terms contained in this Agreement, the Purchaser hereby agrees
that it will tender the purchase price (the "Purchase Price") of $0.05 (Five
Cents) to buy up to 5,000,000 (Five Million) shares (the "Shares") of public
common stock issued by the Company and Restricted under Rule-144 pursuant to the
purchase schedule in Exhibit-A and made a part hereof. The total amount of
purchase being $ 250,000 (Two Hundred Fifty Thousand Dollars). This sum shall be
tendered in certified funds (cashier check or bank draft) and/or a wire transfer
to the bank account of the Company pursuant to the payment schedule attached and
made a part of herein as Exhibit-A. With the simultaneous payment and delivery
of the Purchase Price by the Purchaser to the Company, the Seller shall issue
and deliver to the Company immediate tender for the said shares of common stock
referenced herein for value of the purchase amount received by the Purchaser.
The Company shall be responsible for assuring that the purchased shares are duly
recorded with the Stock Transfer Agent referred to as Executive Registrar and
Transfer Agency, Inc., located in Englewood, Colorado, and as fully assessable
and paid stock in the corporate stock register and with the records of the
Company's stock transfer agent. Said event shall hereinafter be known as the
"Closing."

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All parties further acknowledge that they have had the opportunity to hire
counsel of their own choosing to serve as counselors and advisors in this
transaction.

2. Representations and Warranties of Seller.
     -----------------------------------------

As a material inducement to Purchaser to enter into this Agreement, Seller
hereby makes the following representations and warranties, effective as of the
date hereof and at Closing;

(a) The execution and delivery of this Agreement and the consummation of the
transaction contemplated hereby does not, and as of Closing shall not, violate
any provision of any existing law or regulation, or any mortgage, indenture,
security agreement, contract, or other agreement to which Seller is a party.

(b) Seller has the full, absolute, and entire power and legal rights to execute,
deliver and perform this Agreement and to consummate the transaction
contemplated hereby.

(c) The Shares to be sold to Purchaser are free and clear of all liens and other
encumbrances.

(d) Each share sold by the Seller to the Purchaser pursuant to this Agreement
shall be a validly issued, fully paid and nonassessable share of unrestricted
common stock of the Corporation.

(e) The Company is a corporation duly incorporated, organized, validly existing
and in good standing under the laws of its' jurisdiction of incorporation and
the Company has the requisite corporate power to carry on its business as now
being conducted.

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     (1) The Seller makes no warranties and representations whatsoever, whether
     express or implied, either directly or indirectly, pertaining to the market
     value of the Shares or the Company. The Purchaser's decision to buy the
     Shares referenced herein are the result of the Purchaser's own due
     diligence, research and investigation. The Purchaser acknowledges that it
     has been advised by the Company that there currently exists no public
     market for the sale of its Shares, The value of the Company and its
     equities will in the future depend upon circumstances that are, in many
     instances, within the control of the Company or its officers and directors.
     These factors include, but are not limited to, the public's perception of
     and need for the Company's products, the types and prices of competing
     products, and the ability of the Company to implement its business plan.

3. Representations and Warranties of Purchaser
     -------------------------------------------

As a material inducement to Seller to enter into this Agreement, Purchaser
Hereby make the following representations and warranties, effective as of the
date hereof and at Closing:

(a) The execution and delivery of this Agreement and the consummation of the
transaction contemplated hereby does not, and as of Closing shall not violate
any provision of any existing law or regulation, or any mortgage, indenture,
security agreement, contact, or other agreement to which Purchaser is a party.

(b) Purchaser has the full, absolute, and entire power and legal right to
execute, deliver and perform Ibis Agreement and to consummate the transaction
contemplated hereby.

(c) Purchaser has sufficient knowledge and experience in investing in companies
similar to the Corporation, in terms of the Corporation's stage of development,
so as to be able to evaluate the risks and merits of its investment in the
Seller's Shares, and it is able financially to bear the risks thereof

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(d) Purchaser has undertaken all due diligence which it deemed necessary or
appropriate and, in furtherance thereof, has had an opportunity to discuss with
the Seller all material aspects and conditions of the Corporation, including the
management and financial affairs of the Corporation, and to obtain information
and examine all documents relating to the Corporation. All questions asked by
the Purchaser have been answered to its full satisfaction, and all information
and documents, records and books pertaining to this investment the Purchaser has
requested have been made available to it.

(e) The Shares being purchased by Purchaser are being provided to various
investors, and as such the Purchaser shall provide instructions to the Seller
regarding issuing the shares in each of the names of the investors. The
Purchaser shall provide the Seller the name in which the certificate should be
issued, the amount of shares to be issued, the address and tax identification of
the name in which the shares are to be issued.

(f) Purchaser understands that the Seller is a public company. Accordingly,
Purchaser understands and acknowledges that the Shares are registered under the
Securities Act of 1933 (the "Act") pursuant to Section 4(2) thereof or Rule 505
and Rule 506 promulgated under the Act.

(g) Purchaser recognizes that an investment in the Shares involves a degree of
risk, and it is fully cognizant of and understands all of the risk factors
related to the purchase of the Shares, and Purchaser has negotiated the terms
and conditions of this Agreement in consideration thereof.

(h) Purchaser warrants and represents that it has had the opportunity to retain
counsel of its' own choosing to advise it and to review and negotiate the terms
and conditions of this transaction.

4. Conditions Precedent to the Obligations of Purchaser.
     -----------------------------------------------------

All obligations of Purchaser to close on the sale and purchase pursuant to this
Agreement shall be subject to the following conditions:

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(a) The Seller shall deliver to the Transfer Agent within the time stipulated in
this Agreement the certificates representing the Shares.

(b) The Stockholders of the Corporation representing a majority of shares
authorized and issued shall consent to the execution by Seller of this
Agreement.

(c) In the event that the Purchaser is not able to meet or complete the Purchase
Schedule in Exhibit-A, the Seller may terminate this Agreement by serving
written notice to the Purchaser and the termination shall be effective seven (7)
days from the date of said written notice. Upon termination, either party shall
not have any claims against the other party.

5. Expenses.
     ---------

Each party hereto shall pay its own expenses in connection with the transaction
contemplated hereby, whether or not such transaction shall be consummated.

6. Brokerage.
     ----------

Each party hereto will indemnify and hold harmless the other from and in respect
to any claim for brokerage or other commissions relative to this Agreement or to
the transactions contemplated hereby, based in any way on agreements,
arrangements or understandings made & claimed to have been made by such party
with any third party.

7. Assignability.
     --------------

This Agreement and the burdens and benefits hereunder are not assignable by
either party without the prior written consent of the other party. The Seller
understands that the Purchaser is representing various investors, and therefore
the Seller authorizes the Purchaser to provide instructions regarding the name
in which each share certificate should be issued. The Purchaser will represent
each of his investors under the terms and conditions herein.

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8. Notices.
     --------

All notices, requests, consents and other communications hereunder shall be in
writing and shall be delivered in person or by overnight courier (with proof of
receipt requested) or mailed by certified or registered mail, return receipt
requested, addressed as follows:

(a) If to the Seller, to Scott Sand, Chairman of Ingen Technologies, Inc.

(b) If to the Purchaser, to or at such other address or addresses as shall have
been furnished by one party to the other in the manner specified in this
paragraph 8.

9. Governing Law.
     --------------

This Agreement shall be governed by and construed in accordance with the laws of
the State of Georgia without giving effect to the conflict of law provisions
thereof.

10. Headings.
     ---------

The descriptive headings of the several provisions and sections of this are
inserted for convenience only and do not constitute a part of this Agreement.

11. Entire Agreement.
     -----------------

This Agreement including the Exhibits hereto constitutes the entire agreement of
the parties with respect to the subject matter hereof. All Exhibits hereto are
incorporated herein by reference.

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12. Counterparts.
     -------------

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

13. Changes and Waiver.
     -------------------

No change or modification of this Agreement shall be valid unless the same is in
writing and signed by all parties. No waiver of any provision of this Agreement
shall be valid unless in writing and signed by the person against whom the
provision is sought to be enforced. The failure of any party at any time to
insist upon strict performance of any condition, promise, agreement or
understanding set forth herein shall not be construed as a waiver or
relinquishment of the right to insist upon strict performance of the same or any
other condition, promise, agreement or understanding at a future time.

14. Survival of Representations and Warranties.
     -------------------------------------------

All of the representations and warranties contained in this Agreement shall
survive (i) the execution of this Agreement and any other documents related
thereto and (ii) the transfer of the Shares to the Escrowee and ultimately to
the Purchaser and shall not be merged therein.

15. Invalid Provisions.
     -------------------

Should any portion of this Agreement be declared invalid or unenforceable for
any reason, it shall be modified and adjusted rather than voided, if possible to
achieve the material intent of the parties. Any invalidity of any provision of
this Agreement shall not affect any other provisions of this Agreement, which
shall be deemed enforceable and valid to the maximum extent possible.

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16. Facsimiles.
     -----------

Facsimile or email transmissions of this Agreement, when duly executed by the
parties or their authorized representatives shall be as effective and legally
binding as executed originals of this Agreement.

17. Exhibits to the Agreement.
     --------------------------

The following documents have been provided to the Purchaser and shall be deemed
to be part of this Agreement and are furnished by the Seller to the Purchaser to
inform it of the Company's activities and plans.

i)    Corporate Charter
ii)   Certificate of Good Standing
iii)  Financial Statement
iv)   Tax Returns
v)    Patents & Trademarks

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IN WITNESS WHEREOF, the parties hereto have executed this Agreement on the year
and date first written above.

Purchaser:

s/s                                                       10/15/04
-------------------------------------------          ----------------
KHOO Yong Sin                                              Date
No. 21 Upper Weld Road
Singapore, 207378
Tel: +65 9746 8288

Ingen Technologies, Inc.

/s/ Scott R. Sand                                        10/15/04
-------------------------------------------          ----------------
Scott R. Sand, Chairman and CEO                            Date

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                                    EXHIBIT-A

PURCHASE SCHEDULE:

The Purchaser agrees to pay $50,000 on or before November 15, 2004

The Purchaser agrees to pay $100,000 on or before December 15, 2004

The Purchaser agrees to pay $100,000 on or before January 15, 2005

                                  Page 11 of 11<PAGE>

                                                                   EXHIBIT 10.19

EXCLUSIVE LICENSING AGREEMENT

This Agreement made effective as of this 24th day of June, 1999, by and between
Ingen Technologies, Inc., a Nevada Corporation doing business in the State of
California, further referred as the ("Company") whose principal corporate
offices are at 576 E. Victoria Court, Lake Arrowhead CA 92352, and Francis &
Bettie McDermott, (Husband & Wife), further referred to as the ("Contractor"),
located at 11619 Lennox Street, Yucaipa CA 92399, and is made with reference to
the following.

RECITALS

A. The Company is an established business providing an oxygen sensing warning
device for the medical, private and government markets.

B. The Company exclusively accepts the rights to the BAFI product over the
following seventeen years (17 yrs) as such product is described in the attached
patent filings referenced as Patent Pending serial number 09/318651 and attached
hereto and under the following terms and conditions.

C. The Contractor has the expertise, knowledge and resources for future
development and implementation of technology enhancements of said product and
grants exclusivity to the Company for a period of seventeen years (17 yrs) the
rights of said product and applications as defined in the patent filings.

D. The Company agrees to market said product at its own expense and will provide
promotional programs, distribution and manufacturing resources to

Initial(s) Company SRS   Contractor FM&BM                            Page 1 of 8
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Exclusive Licensing Agreement Ingen Technologies, Inc.

promote said products and services to be accessed by the distributor(s) and
consumers and used to be distributed in accordance to all laws of which govern
the Company in this type of industry.

E. The Company desires to utilize the Contractor's expertise, knowledge and
other resources for developing new products and/or enhancement to existing
products as described in the above Recitals for the purpose of increasing sales.
The Contractor is willing to provide said expertise, knowledge and other
resources to the Company for the same purpose upon terms and conditions
hereinafter set forth.

NOW, THEREFORE, the Parties mutually agree as follows:

1. In consideration of the Contractor granting an exclusive license for the BAFI
product and furnishing the expertise, knowledge and other resources set forth in
the above Recitals hereof, the Company agrees to pay the Contractor a royalty in
an amount equal to ten percent (10%) of the net profits generated on all BAFI
product sales. In addition, the Company will issue 200,000 shares of common
stock upon execution of this Agreement as well as an employment contract.

2. The Company agrees to pay for all expenses necessary to manufacture, maintain
patents, and promote said product.

3. As part of the services specified herein, the Contractor agrees to provide
technical support in an advisory capacity and maintain a professional
relationship with the Company.

Initial(s) Company SRS   Contractor FM&BM                            Page 2 of 8
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Exclusive Licensing Agreement Ingen Technologies, Inc.

4. Except for the amounts paid to the Contractor as stated in paragraph-i and in
the Recitals herein, the Contractor shall not be entitled to any other payment
and/or reimbursement for services rendered and/or expenses incurred pursuant to
this Agreement by the Company. All costs and expenses incurred by either party
in rendering said services shall be the sole obligation and responsibility of
the individual party and not that of the other. However, the Company may decide
at its own discretion to reimburse other expenses to the Contractor only upon
written authorization to the Contractor by the Company.

5. The Company agrees to provide all administrative support, technical support,
and professional support to the Contractor at all times in accordance to
regulatory guidelines and laws set forth for providing said products and
services for the Company, and without penalty to the Contractor.

6. The Contractor and Company agrees to provide the other with all signed and
completed tax documentation and identification upon the signing of this
Agreement in accordance to State and Federal tax laws.

7. The relationship between both parties created by this Agreement is that of
principal ("the Company") and independent contractor ("the Contractor") in that
the time spent and the professional manner in which the services are performed
shall solely be the responsibility of the Contractor. However, the Contractor
agrees to use its best and most diligent efforts, within all laws, to provide
the resources and expertise for the promotion and/or project development
services provided for the Company.

Initial(s) Company SRS   Contractor FM&BM                            Page 3 of 8
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Exclusive Licensing Agreement Ingen Technologies, Inc.

8. During the term of this Agreement the Contractor shall not promote services,
either directly and/or indirectly, to any entity that has similar services as
provided by the Company, and pursuant to Paragraph 9.

9. In consideration of the importance of confidentiality, non-disclosure and
trade secrets, the Contractor acknowledges that during the course of this
Agreement between the Company and the Contractor, the Contractor has had access
to and will continue to have access to various confidential information and
trade secrets consisting of compilations of information, records, specifications
and trade lists, which are owned by the Company and which are regularly used in
the operation of the Company's business.

In consideration of continued engagement through this Agreement during the
period of the Agreement by the Company, the Contractor shall not disclose any of
the aforesaid confidential information or trade secrets, directly or indirectly,
nor use them in any way, either during the term of this Agreement or at any time
thereafter, except as required in the Contractor's engagement with the Company,
but does not include information already within the public domain at the time
the information is acquired by the Contractor, or information that subsequently
becomes public through no act or omission of the Contractor.

In further consideration of continued engagement and during the period of the
Agreement, all files, records, documents, drawings, specifications, equipment
and similar items relating to the business of the Company, whether prepared by
the Contractors or otherwise, coming into the Contractor's possession shall
remain the exclusive property of the Company and shall not be removed from

Initial(s) Company SRS   Contractor FM&BM                            Page 4 of 8
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Exclusive Licensing Agreement Ingen Technologies, Inc.

the Company's premises under any circumstances whatsoever without prior written
consent of the Company.

During the term of this Agreement, Contractor shall not, directly or indirectly,
either as an employee, employer, consultant, agent, principal, partner,
stockholder, corporate officer, director or in any individual and/or
representative capacity engage or participate in any business that is in
competition in any manner whatsoever with the business of the Company.

10. This Agreement shall continue in effect for a period of seventeen years (17
yrs) and may be continued thereafter only by the express mutual agreement of
both parties. This agreement may be terminated at any time by either party with
cause or breech provided that it is in writing with a thirty day (30-day)
written notice. Upon termination, the Company agrees to pay all outstanding
payments prior to the date of termination.

11. This document contains the entire Agreement of the parties relating to this
Agreement and correctly sets forth the rights, duties and obligations of all
parties hereto. Any prior agreements, promises, negotiations and/or
representations not expressly set forth in this Agreement are of no force and
effect.

12. No waiver of any term or condition of this Agreement shall be deemed or
construed to be a waiver of such term or condition in the future, or of any
preceding or subsequent breach of the same or any other term or condition of
this or any other agreement. All remedies, rights, undertakings, obligations and
agreements contained in this Agreement shall be cumulative and none of them

Initial(s) Company SRS   Contractor FM&BM                            Page 5 of 8
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Exclusive Licensing Agreement Ingen Technologies, Inc.

shall be in limitation of any other remedy, right, undertaking, obligation or
agreement of either party hereto.

13. No amendment or modification of this Agreement or of any covenant, condition
or limitation herein contained shall be valid unless in writing and duly
executed by the party to be charged therewith. Unless otherwise specifically set
forth under a particular provision, any amendment or modification shall require
the overall consent of both parties.

14. Nothing contained in this Agreement shall be construed so as to require the
commission of any act contrary to law, and whenever there is a conflict between

any provision of this Agreement and any statute, law, ordinance, rule, order or
regulation, the later shall prevail, but in such event any such provision of
this Agreement shall be curtailed and limited only to the extent necessary to
bring it within the legal requirements.

15. This Agreement, and all rights and obligations contained herein shall be
binding on and inure to the benefit of the parties hereto and their respective
heirs, executors, legal and personal representatives, successors and assigns. It
is also specifically agreed and understood that this Agreement shall be binding
upon any successor-in-interest to the Company by way of merger, consolidation or
otherwise.

16. Any controversy arising out of or in connection with this Agreement, or any
amendment thereof, shall be determined and settled by arbitration in accordance
with the rules of the American Arbitration Association. The venue for such
arbitration shall be exclusively the State of California, San Bernardino County,

Initial(s) Company SRS   Contractor FM&BM                            Page 6 of 8
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Exclusive Licensing Agreement I ngen Technologies, Inc.

and any award rendered shall be final and binding on each and all of the parties
thereto and their successor-in-interest, and judgment may be entered thereon in
any court having jurisdiction thereon. In any such proceeding, the Arbitrator
shall be and hereby is empowered to render an award directing specific
performance. Each individual party shall take responsibility for obligations
pertaining to costs associated with their own legal representation.

17. All notices among the parties hereto shall be in writing and shall be deemed
duly srved when personally delivered to another party or, in lieu of such perso
al service, when deposited in the United States mail, certified and return
receip requested, with first class postage prepaid thereon, addressed as set
forth bove, or in such other place as may be specified in any written notice
given pursuant to this paragraph as the address for service of notice. All
notices shall be delivered to the parties addresses as witnessed below.

Company: Scott R. Sand, CEO

Ingen Technologies, Inc.

P.O. Box 367

576 East Victoria Court

Lake Arrowhead CA 92352-0367

Contractor: Francis & Bettie McDermott 11619 Lennox Street

Yucaipa CA 92399

Initial(s) Company SRS   Contractor FM&BM                            Page 7 of 8
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Exclusive Licensing Agreement

Ingen Technologies, Inc.

IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the
date first set forth above and agree to all of the terms and conditions of this
Agreement set forth herein.

18. This Agreement shall be governed and construed in accordance with laws of
the State of California.

The Company:

/s/ Scott R. Sand                                     6/24/99
---------------------------------------          ----------------
Scott R. Sand, CFO                                     Date

The Contractor:

/s/ Francis McDermott                                 6/24/99
---------------------------------------          ----------------
Francis McDermott                                      Date

/s/ Bettie McDermott                                  6/24/99
---------------------------------------          ----------------
Bettie McDermott                                       Date

Notarized Required:

Initial(s) Company SRS   Contractor FM&BM                            Page 8 of 8
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