Document:

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                                                                   EXHIBIT 10.22

                              EMPLOYMENT AGREEMENT

        THIS AGREEMENT is made effective on October 28, 1999, between HYPERBARIC
SYSTEMS, whose address is 1127 Harker Avenue, Palo Alto, CA 94301, incorporated
under the laws of the State of California, hereinafter called "EMPLOYER", or
"COMPANY and Ardeth Sealy, whose address is 902 Santa Rosa Court, Roseville, CA
95661, hereinafter called "EMPLOYEE".

                                   WITNESSETH:

               1. PURPOSE OF AGREEMENT. HYPERBARIC SYSTEMS is a duly established
California corporation engaged in the business of designing, manufacturing and
marketing products for the medical, food and semiconductor industries, and
EMPLOYEE represents that he has experience in the area of accounting, finance,
humane resources and materials management for high technology companies. This
agreement between EMPLOYER and EMPLOYEE is entered into for the purpose of
defining the relationship, responsibilities, and agreement between EMPLOYER and
EMPLOYEE.

               2. EMPLOYMENT: EMPLOYER hereby employs Ardeth Sealy as the
Company's Chief Financial Officer and Secretary, effective January 1, 1999.

               3. EMPLOYEE DUTIES AND RESPONSIBILITIES. EMPLOYEE shall be
employed as Chief Financial Officer and Secretary with the following duties and
responsibilities:

                      a. Establish and maintain the company's financial records.

                      b. Establish and maintain the company's human resource
                      functions.

                      c. Establish and maintain the company's public reporting
                      process.

                      d. Manage the accounting, financial reporting, investor
                      relations, information technology and human resource
                      departments and functions.

                      e. Ensure the COMPANY is in compliance with all regulatory
                      bodies.

                      f. Perform tasks and become involved in projects as
                      directed by the President.

                      g. Establish liability risk options for the COMPANY, to
                      purchase insurance or the COMPANY to establish operating
                      procedures that limit the risk liability.

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               4. EMPLOYEE'S PERFORMANCE. EMPLOYEE shall work as agreed upon by
the parties. Employee agrees to devote his best efforts to the Corporation's
business and devote his efforts to the Corporation for the performance of his
duties as Chief Financial Officer and Secretary, and perform other duties and
responsibilities as directed by the President.

               5. TERM. The term of this Agreement shall be effective for a
minimum term of one year from the date of this Agreement and continue until
thirty days' written notice of termination by either party. It is the intent of
the parties that this contract shall continue indefinitely until terminated by
either party.

               6. COMPENSATION. For the services rendered by EMPLOYEE hereunder,
EMPLOYEE shall be compensated at an amount to be determined by the following
formula, but may be adjusted as agreed to by both parties.

                      a.  $6,000 per month commencing October 1999 until the
                          Company raises $1,000,000 in funding pursuant to the
                          Private Placement Memorandum dated September 1, 1999
                          or later.

                      b.  $7,000 per month when the Company raises at least
                          $1,000,000 pursuant to the Private Placement
                          Memorandum dated September 1, 1999 or later.

                      c.  $8,000 per month when the Company raises at least
                          $2,000,000 pursuant to the Private Placement
                          Memorandum dated September 1, 1999 or later.

                      d.  $9,200 per month when the Company raises at least
                          $3,000,000 pursuant to the Private Placement
                          Memorandum dated September 1, 1999 or later.

                      e.  Employee will be eligible to participate in any
                          executive compensation and bonus plans the Employer
                          may establish.

               7. STOCK OPTION. For the purpose of further motivating EMPLOYEE,
the following STATUTORY INCENTIVE STOCK OPTIONS are hereby granted under the
Statutory Incentive Stock Option Plan of the Company, and issued under the
Notice of Grant of Statutory Stock Option, and the Statutory Stock Option
Agreement, which are included as part of this Agreement and listed as Exhibit A.
The Stock Option Grant requires approval by the Board of Directors.

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                      a. 40,000 shares at a price equal to the last close price
as of October 1, 1999 vested over three years, exercisable yearly at the rate of
30%, 30% and 40% respectively.

               8. BONUS After the first year of employment (January 1, 2000) and
up to the expiration of the options, Employer agrees to grant a bonus of up to
$1,000 to EMPLOYEE.

               9. VACATION, HOLIDAYS AND ABSENCE. EMPLOYEE shall be entitled to
annual paid vacations of fifteen days per year plus such holidays as adopted by
the Company as paid holidays.

               10. EMPLOYEE BENEFITS. Employee shall be entitled to participate
in all benefits offered to the COMPANY'S employees. Such benefits may include by
not limited to group medical, dental and vision insurance, life insurance or
other insurance or benefits adopted by the Company.

               11. TERMINATION UPON BREACH. This Agreement shall be terminated
upon material breach of any of the provisions herein, or breach of the material
provisions of any and all supplemental agreements which the EMPLOYEE and
EMPLOYER may mutually execute.

               12. CONFIDENTIALITY AGREEMENT. EMPLOYEE agrees that all
information made available to EMPLOYEE regarding the products, clients and
software systems of EMPLOYER are confidential and require a high degree of
confidentiality so as not to violate the rights of others and to prevent the use
thereof for purposes detrimental to the interests of EMPLOYER and its clients.
Such information in any form shall be hereinafter referred to as "INFORMATION."
For purposes of this Agreement:

                      a. CONFIDENTIAL INFORMATION means INFORMATION disclosed to
or acquired by EMPLOYEE while employed by EMPLOYER, and includes but is not
limited to, INVENTIONS, Patent Applications, TRADE SECRETS, any other
information of value relating to the business and/or field of interest of
EMPLOYER including information with respect to which EMPLOYER is under an
obligation of confidentiality with any third party. CONFIDENTIAL INFORMATION
does not include information that is generally known in the relevant trade or
industry or any information known to and freely usable by EMPLOYEE before
EMPLOYEE's association with EMPLOYER, provided, however, information for
purposes of this Agreement shall be considered CONFIDENTIAL INFORMATION if not
known by the trade generally, even though such information has been disclosed to

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one or more third parties pursuant to distribution agreements, joint research
agreements, or other agreements entered into by EMPLOYER;

                      b. TRADE SECRET(S) means all information, know-how,
concepts, data, knowledge, ideas and materials however embodied, relating to the
business of EMPLOYER's customers which have not been released publicly by an
authorized representative of EMPLOYER or have not otherwise lawfully entered the
public domain. TRADE SECRETS shall include but are not limited to information,
know-how, concepts, data, knowledge, computer programs, ideas and materials
relating to EMPLOYER's existing and future products, processes, research and
development, technology, production costs, contract forms, drawings, designs,
plans, proposals, marketing and sales plans and strategies, cost or pricing
information, financial information, promotional methods, volume of sales, names
or classes of customers and vendors, management procedures, organization charts,
and employee directories.

               13. PROPRIETARY INFORMATION OF OTHERS. EMPLOYEE shall not use or
disclose to EMPLOYER, or induce EMPLOYER to use, any information, know-how,
concepts, data, knowledge, computer programs, ideas or materials, however
embodied, with respect to which EMPLOYEE is under an obligation of
confidentiality to any third party imposed, by law or agreement prior to the
date hereof. EMPLOYER represents and covenants that it will not require EMPLOYEE
to violate any obligation to, or confidence with, another.

               14. SECRECY AGREEMENT. EMPLOYEE acknowledges that he understands
the requirement for CONFIDENTIAL INFORMATION to be kept secret and used only as
authorized herein. EMPLOYEE shall at all times during the period of his
association with EMPLOYER under this agreement and thereafter keep in confidence
and trust all CONFIDENTIAL INFORMATION. EMPLOYEE shall use CONFIDENTIAL
INFORMATION only in the course of performing duties as Chief Financial Officer
and Secretary for the Company and other duties as assigned by the Company
President, and not for unrelated personal gain. EMPLOYEE shall not, directly or
indirectly, disclose any CONFIDENTIAL INFORMATION to any person, organization or
entity, except in the course of performing duties as a EMPLOYEE of EMPLOYER and
only in the manner prescribed by EMPLOYER. Employee shall abide by those
EMPLOYER policies and regulations established from time to time for the
protection of CONFIDENTIAL INFORMATION. During EMPLOYEE's association with
EMPLOYER

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under this Agreement, and after termination thereof, EMPLOYEE shall not
directly, or indirectly, either as an employee, employer, agent, principal,
partner, stockholder, corporate officer, director, or in any other individual or
representative capacity, engage or participate in any activity of any nature
whatsoever, the performance of which would have a reasonable likelihood of
placing EMPLOYEE in conflict with the obligations of confidence and trust
regarding CONFIDENTIAL INFORMATION imposed herein.

               15. RETURN OF DOCUMENTS AND MATERIALS. EMPLOYEE agrees that all
documents, reports, drawings, materials, designs, plans, computer programs,
proposals, marketing and sales plans, reproductions, and other documents or
things made by EMPLOYEE or that come into EMPLOYEE's possession in the course of
employment with EMPLOYER are the property of EMPLOYER and will not be used by
EMPLOYEE for any purpose other than the business of EMPLOYER. EMPLOYEE will not
deliver, reproduce or in any way allow such documents or things to be delivered
or be used by any third parties without specific direction or consent of
EMPLOYER. Upon termination of this Agreement, EMPLOYEE will promptly deliver to
EMPLOYER the above documents and materials together with any copies thereof, at
EMPLOYER expense.

               16. NO DISCLOSURE. EMPLOYEE agrees not to divulge, disclose,
convey or make known to others or any other entity, any such information without
the express written consent of the President of HyperBaric Systems first
obtained. EMPLOYEE further agrees to take all necessary steps to safeguard such
information to prevent the unauthorized disclosure thereof.

               17. INJUNCTION. Recognizing that irreparable damage will result
to the business of EMPLOYER in the event of the breach of any of these covenants
and assurances by EMPLOYEE, the parties hereto agree that if EMPLOYEE shall
violate the terms of this Agreement, EMPLOYER shall be entitled to an injunction
to be issued by any court of competent jurisdiction enjoining and restraining
EMPLOYEE and each and every person, firm, association, partnership, company, or
corporation concerned therewith, from the continuance of such violation of the
terms of this Agreement, and in addition thereto, EMPLOYEE shall pay to EMPLOYER
all damages, including reasonable attorneys' fees sustained by EMPLOYER by
reason of the violation of this Agreement.

               18. NO ASSIGNMENT. Neither the EMPLOYEE nor EMPLOYER may transfer
or assign this Agreement, or any right or obligation hereunder, without the
prior written

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consent of the other party. No right or obligation under this Agreement may be
waived, modified, or in any respect altered except by written agreement of the
parties executed in writing by both parties.

               19. SUCCESSORS AND ASSIGNS. This agreement shall be binding on
the heirs, executors, successors and assigns of the parties.

               20. ATTORNEYS FEES. If any action is brought to enforce any
obligation created under this Agreement, the Court shall award to the prevailing
party, such reasonable fees, costs, and expenses as may have been incurred by
such party in enforcing its rights under this Agreement, including without
limitation, the fees, costs, and expenses of its attorney for services both
before or after litigation is instituted.

               21. ENTIRE AGREEMENT. This Agreement may not be changed except in
writing signed by the President of the Company and the EMPLOYEE. The validity,
performance, construction, and effect of this Agreement shall be governed by the
laws of the State of California

               IN WITNESS WHEREOF, the parties hereto have executed this
Agreement as of the day and year first above written.

        "EMPLOYER"                           "EMPLOYEE"

HYPERBARIC SYSTEMS                           Ardeth Sealy
1127 Harker Avenue                           902 Santa Rosa Court
Palo Alto, California 94301                  Roseville, CA 95661

By:
   --------------------------------          -----------------------------------
   HARRY MASUDA, PRESIDENT                   Ardeth Sealy

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                               HYPERBARIC SYSTEMS
                    NOTICE OF GRANT OF STATUTORY STOCK OPTION

        NOTICE is hereby given of the following stock option grant (the
"Option") to purchase shares of the Common Stock of HYPERBARIC SYSTEMS (the
"Company"):

        EMPLOYEE OPTIONEE    :              ARDETH N. SEALY

        GRANT DATE           :              10/1/99

        OPTION PRICE         :              $1.62 PER SHARE

        NUMBER OF OPTIONED
         SHARES              :              40,000

        EXPIRATION DATE      :              10/1/04

        TYPE OF OPTION       :              EMPLOYEE INCENTIVE STOCK OPTION

        EXERCISE SCHEDULE    :              30% AFTER FIRST YEAR  10/1/00
                                            30% AFTER SECOND YEAR 10/1/01
                                            40% AFTER THIRD YEAR  10/1/02

        Employee/Optionee understands that the Option is granted subject to and
in accordance with the express terms and conditions of the HYPERBARIC SYSTEMS,
1998 Statutory Stock Option Plan (The "Plan"). Employee/Optionee agrees to be
bound by the terms and conditions of the Plan and the terms and conditions of
the Option as set forth in the Statutory Incentive Stock Option Agreement
attached hereto as Exhibit A.

        Optionee hereby acknowledges receipt of a copy of the Plan in the form
attached hereto as Exhibit B.

Dated:                                       HYPERBARIC SYSTEMS
      -----------------------------
                                             By
                                               ---------------------------------
                                               HARRY MASUDA, President

                                             "EMPLOYEE/OPTIONEE"

                                               ---------------------------------
                                                       (Signature)

                                               Ardeth N. Sealy
                                               ---------------------------------
                                                       (Type Name)

                                               902 Santa Rosa Court
                                               ---------------------------------
                                               Roseville, CA 95661
                                               ---------------------------------
                                                       (Address)<PAGE>   1
                                                                   EXHIBIT 10.23

                            STATUTORY INCENTIVE STOCK
                                OPTION AGREEMENT

        This AGREEMENT is made between HYPERBARIC SYSTEMS, having a principal
place of business at 1127 Harker Avenue, Palo Alto, CA 94301, hereafter referred
to as "Employer," and , hereinafter referred to as "Employee."

                                 OPTION GRANTED

        1. Employer hereby grants Employee an option to purchase shares of
common stock at a purchase price of $ per share.

                           TIME OF EXERCISE OF OPTION

        2. Employee may exercise this option to purchase his or her shares
according to the following schedule:

               30%    After 1st year    10/1/00
               30%    After 2nd year    10/1/01
               40%    After 3rd year    10/1/02

until termination of the option as provided in Paragraph 7, below, so long as at
all times, beginning with the date of the grant of this option and ending three
months prior to the date of exercise, or 12 months prior to the date of exercise
if the employee is disabled within the meaning of Internal Revenue Code Section
22(e)(3), Employee remains employed. For purposes of this Agreement,
"employment" means that Employee is employed by Employer, a parent or subsidiary
corporation of such a corporation issuing or assuming a stock option in a
transaction to which Internal Revenue Code Section 424(a) applies.

                               METHOD OF EXERCISE

        3. This option shall be exercised by Employee, or in the case of the
exercise after Employee's death, the Employee's executor, administrator, heir or
legatee, as the case may be, by written notice delivered to Employer at its
principal place of business, stating the number of shares for which the option
is being exercised. The notice must be accompanied by a check or other payment
in full in any other form which the Committee who administers the Plan, may, in
its discretion, approve at the time of the exercise in accordance with Paragraph
4 of this Agreement.

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        In the case of the exercise of an Employee's option after death, the
person or persons exercising on behalf of the deceased Employee shall provide
appropriate documentation establishing their right to act on behalf of the
decedent.

                                      LOANS

        4. The Committee acting as plan administrator may, in its absolute
discretion and without any obligation to do so, assist the Employee in the
exercise of this option by (1) authorizing the extension of a loan to the
Employee from the Company or (ii) permitting the Employee to pay the option
price for the purchased shares of stock in installments over a period of years.
The terms of the loan or installment method of payment (including the interest
rate, the collateral requirements and terms of repayment) shall be established
by the Committee as plan administrator, in its sole discretion.

                               CAPITAL ADJUSTMENTS

        5.(a) The existence of this option shall not affect in any way the right
or power of Employer or its stockholders to make or authorize any or all
adjustments, recapitalizations, reorganizations, or other changes in Employer's
capital structure or its business, or any merger or consolidation of Employer or
any issue of bonds, debentures, preferred or prior preference stocks ahead of or
affecting the common stock or the rights thereof, or the issuance of any
securities convertible into any common stock or of any rights, options, or
warrants to purchase any common stock, or the dissolution or liquidation of
Employer, any sale or transfer of all or any part of its assets or business, or
any other corporate act or proceedings of Employer, whether of a similar
character or otherwise.

        (b) The shares with respect to which this option is granted are shares
of the common voting stock of HYPERBARIC SYSTEMS as presently constituted, but
if and whenever, prior to the delivery by Employer of all the shares of the
stock with respect to which this option is granted, Employer shall effect a
subdivision or consolidation of shares or other capital readjustment, the
payment of a stock dividend, or other increase or reduction of the number of
shares of the stock outstanding without receiving compensation therefor in
money, services, or property, the number of shares of stock then remaining
subject to this option shall (a) in the event of an increase in the number of
outstanding shares, be proportionately increased, and the cash consideration
payable per share shall be proportionately reduced; and (b) in the event of a
reduction in the number of outstanding shares, be proportionately reduced, and
the cash consideration payable per share shall be proportionately increased.

                            MERGER AND CONSOLIDATION

        6.(a) Following the merger of one or more corporations into Employer or
any consolidation of Employer and one or more corporations in which Employer is
the surviving corporation, the exercise of these options shall apply to the
shares of the surviving corporation.

        (b) Notwithstanding any other provision of this Agreement, this option
shall terminate on the dissolution or liquidation of Employer, or on any merger
or consolidation in which Employer is not the surviving corporation.

                               TRANSFER OF OPTION

        7. During Employee's lifetime, this option shall be exercisable only by
Employee. This option shall not be transferable by Employee other than by the
laws of the descent and distribution upon Employee's death. In the event of
Employee's death during employment or during the applicable period after
termination of employment specified in Paragraph 2 above, Employee's personal
representatives may exercise any portion of this option that remains unexercised
at the time of Employee's death, provided that any such exercise must be made,
if at all, during the period within one year after Employee's death, and subject
to the option termination date specified in Paragraph 7(c) below.

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                              TERMINATION OF OPTION

        8. This option shall terminate on the earliest of the following dates:

               a. The expiration of three months from the date of Employee's
termination of employment, as defined in Paragraph 2, above, except for
termination due to death or permanent and total disability.

               b. The expiration of twelve months from the date on which
Employee's employment, as defined in Paragraph 2 above, is terminated due to
permanent and total disability, as defined in Internal Revenue Code Section
22(e)(3); or,

               c. Five years from the date of the granting of this option.

                              RIGHTS AS SHAREHOLDER

        9. Employee will not be deemed to be a holder of any shares pursuant to
the exercise of this option until Employee pays the option price and a stock
certificate is delivered to Employee for those shares. No adjustments shall be
made for dividends or other rights for which the record date is prior to the
date the stock certificate is delivered.

                                  CONSTRUCTION

        10. This Agreement and the option evidenced hereby are made and granted
pursuant to the Plan and are in all respects limited by and subject to the
express terms and provision of the Plan. All decisions of the Plan Administrator
and/or Compensation Committee with respect to any question shall be conclusive
and binding on all persons having an interest in this option.

                                  GOVERNING LAW

        11. The interpretation, performance, and enforcement of this Agreement
shall be governed by the laws of the State of California.

                        EFFECTIVE DATE OF THIS AGREEMENT

        12. The effective date of this Agreement and granting of option to the
Employee shall be the date this agreement is signed and written herein below.

        EXECUTED THIS DAY OF OCTOBER, 1999, AT PALO ALTO, CALIFORNIA.

            "EMPLOYER"                                   "EMPLOYEE"

        HYPERBARIC SYSTEMS

BY:
   --------------------------------                            (Signature)
    HARRY MASUDA, PRESIDENT
                                             Ardeth N. Sealy
                                                               (Type Name)

                                             902 Santa Rosa Court

                                             Roseville, CA 95661
                                                             (Type Address)

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