<PAGE>

                                                                    EXHIBIT 4.25



THIS WARRANT AND THE SECURITIES ISSUABLE UPON EXERCISE HEREOF HAVE NOT BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"),
OR ANY STATE SECURITIES LAW, AND MAY NOT BE SOLD, TRANSFERRED, ASSIGNED,
PLEDGED, HYPOTHECATED OR OTHERWISE DISPOSED OF OR EXERCISED UNLESS (i) A
REGISTRATION STATEMENT UNDER THE SECURITIES ACT AND APPLICABLE STATE SECURITIES
LAWS SHALL HAVE BECOME EFFECTIVE WITH REGARD THERETO, OR (ii) AN EXEMPTION FROM
REGISTRATION UNDER THE SECURITIES ACT AND APPLICABLE STATE SECURITIES LAWS IS
AVAILABLE IN CONNECTION WITH SUCH OFFER, SALE OR TRANSFER.

AN INVESTMENT IN THESE SECURITIES INVOLVES A HIGH DEGREE OF RISK. HOLDERS MUST
RELY ON THEIR OWN ANALYSIS OF THE INVESTMENT AND ASSESSMENT OF THE RISKS
INVOLVED.


Warrant to Purchase
7,674,853 shares                                             Warrant Number LV-2

                        WARRANT TO PURCHASE COMMON STOCK
                                       OF
                            PATRIOT SCIENTIFIC CORP.

        THIS CERTIFIES that LINCOLN VENTURES, LLC or any subsequent holder
hereof ("Holder") has the right to purchase from Patriot Scientific Corp., a
Delaware corporation (the "Company"), up to 7,674,853 fully paid and
nonassessable shares, of the Company's common stock, $0.00001 par value per
share ("Common Stock"), subject to adjustment as provided herein, at a price
equal to the Exercise Price as defined in Section 3 below, at any time beginning
on the Date of Issuance (defined below) and ending at 5:00 p.m., New York, New
York time, on the date that is five (5) years after the Date of Issuance (the
"Exercise Period").

        Holder agrees with the Company that this Warrant to Purchase Common
Stock of the Company (this "Warrant" or this "Agreement") is issued and all
rights hereunder shall be held subject to all of the conditions, limitations and
provisions set forth herein.

        1. Date of Issuance and Term.

        This Warrant shall be deemed to be issued on June 10, 2002 ("Date of
Issuance"). The term of this Warrant is five (5) years from the Date of
Issuance.

        Notwithstanding anything to the contrary herein, the applicable portion
of this Warrant shall not be exercisable during any time that, and only to the
extent that, the number of shares of Common Stock to be issued to Holder upon
such exercise, when added to the number of shares of Common Stock, if any, that
the



                                       1
<PAGE>

Holder otherwise beneficially owns (outside of this Warrant, and not including
any other warrants having a provision substantially similar to this paragraph)
at the time of such exercise, would exceed 4.99% of the number of shares of
Common Stock then outstanding, as determined in accordance with Section 13(d) of
the Exchange Act (the "4.99% Limitation"). The 4.99% Limitation shall be
conclusively satisfied if the applicable Exercise Notice includes a signed
representation by the Holder that the issuance of the shares in such Exercise
Notice will not violate the 4.99% Limitation, and the Company shall not be
entitled to require additional documentation of such satisfaction.

        Notwithstanding the above, in the event that the Company receives any
tender offer or any offer to enter into a merger with another entity whereby the
Company shall not be the surviving entity (an "Offer"), then "4.99%" shall be
automatically revised immediately after such offer to read "9.99%" each place it
occurs in this Section 1. Notwithstanding the above, Holder shall retain the
option to either exercise or not exercise its option(s) to acquire Common Stock
pursuant to the terms hereof after an Offer, and, in the event of a cash
exercise following a tender offer, the Exercise Price per share that would
otherwise be due shall instead be offset against the tender price per share to
be received by the Holder, provided, however, that in the event a tender offer
is not completed, Holder shall promptly pay to the Company the Exercise Price
that would have been due at the time the Warrant was exercised.

        2. Exercise.

        (a) Manner of Exercise. During the Exercise Period, this Warrant may be
exercised as to all or any lesser number of full shares of Common Stock covered
hereby (the "Warrant Shares") upon surrender of this Warrant, with the Exercise
Form attached hereto as Exhibit A (the "Exercise Form") duly completed and
executed, together with the full Exercise Price (as defined below) for each
share of Common Stock as to which this Warrant is exercised, at the office of
the Company, Patriot Scientific Corporation, Attn: Lowell W. Giffhorn, CFO;
10989 Via Frontera, San Diego, CA 92127; Telephone: (619) 674-5000, Facsimile:
(619) 674-5005 or at such other office or agency as the Company may designate in
writing, by overnight mail, with an advance copy of the Exercise Form sent to
the Company and its Transfer Agent by facsimile (such surrender and payment of
the Exercise Price hereinafter called the "Exercise of this Warrant").

        (b) Date of Exercise. The "Date of Exercise" of the Warrant shall be
defined as the date that the advance copy of the completed and executed Exercise
Form is sent by facsimile to the Company, provided that the original Warrant and
Exercise Form are received by the Company as soon as practicable thereafter.
Alternatively, the Date of Exercise shall be defined as the date the original
Exercise Form is received by the Company, if Holder has not sent advance notice
by facsimile. The Company shall not be required to deliver the shares of Common
Stock to the Holder until the requirements of Section 2(a) above are satisfied.

        (c) Cancellation of Warrant. This Warrant shall be canceled upon the
Exercise of this Warrant, and, as soon as practical after the Date of Exercise,
Holder shall be entitled to receive Common Stock for the number of shares
purchased upon such Exercise of this Warrant, and if this Warrant is not
exercised in full, Holder shall be entitled to receive a new Warrant (containing
terms identical to this Warrant) representing any unexercised portion of this
Warrant in addition to such Common Stock.



                                       2
<PAGE>

        (d) Holder of Record. Each person in whose name any Warrant for shares
of Common Stock is issued shall, for all purposes, be deemed to be the Holder of
record of such shares on the Date of Exercise of this Warrant, irrespective of
the date of delivery of the Common Stock purchased upon the Exercise of this
Warrant. Nothing in this Warrant shall be construed as conferring upon Holder
any rights as a stockholder of the Company.

        3. Payment of Warrant Exercise Price.

                  The Exercise Price ("Exercise Price") shall initially equal
$0.08616 per share (the "Initial Exercise Price") or, if the Date of Exercise is
more than six (6) months after the Date of Issuance, the lesser of (i) the
Initial Exercise Price or (ii) the "Lowest Reset Price," as that term is defined
below. The Company shall calculate a "Reset Price" on each six-month anniversary
date of the Date of Issuance which shall equal the Market Price (as defined
below) on such six-month anniversary date of the Date of Issuance. The "Lowest
Reset Price" shall equal the lowest Reset Price determined on any six-month
anniversary date of the Date of Issuance preceding the Date of Exercise, taking
into account, as appropriate, any adjustments made pursuant to Section 5 hereof.

        Payment of the Exercise Price may be made by either of the following, or
a combination thereof, at the election of Holder:

        (i) Cash Exercise: cash, bank or cashiers check or wire transfer; or

        (ii) Cashless Exercise: surrender of this Warrant at the principal
office of the Company together with notice of cashless election, in which event
the Company shall issue Holder a number of shares of Common Stock computed using
the following formula:

                                  X = Y (A-B)/A

where:  X = the number of shares of Common Stock to be issued to Holder.

        Y = the number of shares of Common Stock for which this Warrant is being
exercised.

                  A = the Market Price of one (1) share of Common Stock (for
        purposes of this Section 3(ii), where "MARKET PRICE," as of any date,
        means the Volume Weighted Average Price (as defined herein) of the
        Company's Common Stock during the ten (10) consecutive trading day
        period immediately preceding the date in question.

        As used herein, the "VOLUME WEIGHTED AVERAGE PRICE" for any security as
        of any date means the volume weighted average sale price on the Over the
        Counter Electronic Bulletin Board (the "OTC-BB") as reported by, or
        based upon data reported by, Bloomberg Financial Markets or an
        equivalent, reliable reporting service mutually acceptable to and
        hereafter designated by holders of a majority in interest of the
        Warrants and the Company ("BLOOMBERG") or, if the OTC-BB is not the
        principal trading market for such security, the volume weighted average
        sale price of such



                                       3
<PAGE>

        security on the principal securities exchange or trading market where
        such security is listed or traded as reported by Bloomberg, or, if no
        volume weighted average sale price is reported for such security, then
        the last closing trade price of such security as reported by Bloomberg,
        or, if no last closing trade price is reported for such security by
        Bloomberg, the average of the bid prices of any market makers for such
        security that are listed in the "pink sheets" by the National Quotation
        Bureau, Inc. If the Volume Weighted Average Price cannot be calculated
        for such security on such date in the manner provided above, the volume
        weighted average price shall be the fair market value as mutually
        determined by the Company and the holders of a majority in interest of
        the Warrants being exercised for which the calculation of the volume
        weighted average price is required in order to determine the Exercise
        Price of such Warrants. "TRADING DAY" shall mean any day on which the
        Common Sock is traded for any period on the OTC-BB, or on the principal
        securities exchange or other securities market on which the Common Stock
        is then being traded.

               B = the Exercise Price.

        For purposes of Rule 144 and sub-section (d)(3)(ii) thereof, it is
intended, understood and acknowledged that the Common Stock issuable upon
exercise of this Warrant in a cashless exercise transaction shall be deemed to
have been acquired at the time this Warrant was issued. Moreover, it is
intended, understood and acknowledged that the holding period for the Common
Stock issuable upon exercise of this Warrant in a cashless exercise transaction
shall be deemed to have commenced on the date this Warrant was issued.

        4. Transfer and Registration.

        (a) Transfer Rights. Subject to the provisions of Section 8 of this
Warrant, this Warrant may be transferred on the books of the Company, in whole
or in part, in person or by attorney, upon surrender of this Warrant properly
completed and endorsed. This Warrant shall be canceled upon such surrender and,
as soon as practicable thereafter, the person to whom such transfer is made
shall be entitled to receive a new Warrant or Warrants as to the portion of this
Warrant transferred, and Holder shall be entitled to receive a new Warrant as to
the portion hereof retained.

        (b) Registrable Securities. The Common Stock issuable upon the exercise
of this Warrant has registration rights pursuant to that certain Registration
Rights Agreements between the Company and Lincoln Ventures, LLC dated April 23,
2002.

        5. Anti-Dilution Adjustments.

        (a) Stock Dividend. If the Company shall at any time declare a dividend
payable in shares of Common Stock, then Holder, upon Exercise of this Warrant
after the record date for the determination of holders of Common Stock entitled
to receive such dividend, shall be entitled to receive upon Exercise of this
Warrant, in addition to the number of shares of Common Stock as to which this
Warrant is exercised, such



                                       4
<PAGE>

additional shares of Common Stock as such Holder would have received had this
Warrant been exercised immediately prior to such record date and the Exercise
Price will be proportionately adjusted.

        (b) Recapitalization or Reclassification. If the Company shall at any
time effect a recapitalization, reclassification or other similar transaction of
such character that the shares of Common Stock shall be changed into or become
exchangeable for a larger or smaller number of shares, then upon the effective
date thereof, the number of shares of Common Stock which Holder shall be
entitled to purchase upon Exercise of this Warrant shall be increased or
decreased, as the case may be, in direct proportion to the increase or decrease
in the number of shares of Common Stock by reason of such recapitalization,
reclassification or similar transaction, and the Exercise Price shall be, in the
case of an increase in the number of shares, proportionally decreased and, in
the case of decrease in the number of shares, proportionally increased. The
Company shall give Holder the same notice it provides to holders of Common Stock
of any transaction described in this Section 5(b).

        (c) Distributions. If the Company shall at any time distribute for no
consideration to holders of Common Stock cash, evidences of indebtedness or
other securities or assets (other than cash dividends or distributions payable
out of earned surplus or net profits for the current or preceding years) then,
in any such case, Holder shall be entitled to receive, upon Exercise of this
Warrant, with respect to each share of Common Stock issuable upon such exercise,
the amount of cash or evidences of indebtedness or other securities or assets
which Holder would have been entitled to receive with respect to each such share
of Common Stock as a result of the happening of such event had this Warrant been
exercised immediately prior to the record date or other date fixing shareholders
to be affected by such event (the "Determination Date").

        (d) Notice of Consolidation or Merger. In the event of a merger,
consolidation, exchange of shares, recapitalization, reorganization, or other
similar event, as a result of which shares of Common Stock shall be changed into
the same or a different number of shares of the same or another class or classes
of stock or securities or other assets of the Company or another entity or there
is a sale of all or substantially all the Company's assets (a "Corporate
Change"), then this Warrant shall be exercisable into such class and type of
securities or other assets as Holder would have received had Holder exercised
this Warrant immediately prior to such Corporate Change; provided, however, that
Company may not affect any Corporate Change unless it first shall have given
thirty (30) days notice to Holder hereof of any Corporate Change.

        (e) Exercise Price Adjusted. As used in this Warrant, the term "Exercise
Price" shall mean the purchase price per share specified in Section 3 of this
Warrant, until the occurrence of an event stated in subsection (a), (b) or (c)
of this Section 5, and thereafter shall mean said price as adjusted from time to
time in accordance with the provisions of said subsection. No such adjustment
under this Section 5 shall be made unless such adjustment would change the
Exercise Price at the time by $.01 or more; provided, however, that all
adjustments not so made shall be deferred and made when the aggregate thereof
would change the Exercise Price at the time by $.01 or more. No adjustment made
pursuant to any provision of this Section 5 shall have the net effect of
increasing the Exercise Price in relation to the split adjusted and distribution
adjusted price of the Common Stock. The number of shares of Common Stock subject
hereto shall increase proportionately with each decrease in the Exercise Price.



                                       5
<PAGE>

        (f) Adjustments: Additional Shares, Securities or Assets. In the event
that at any time, as a result of an adjustment made pursuant to this Section 5,
Holder shall, upon Exercise of this Warrant, become entitled to receive shares
and/or other securities or assets (other than Common Stock) then, wherever
appropriate, all references herein to shares of Common Stock shall be deemed to
refer to and include such shares and/or other securities or assets; and
thereafter the number of such shares and/or other securities or assets shall be
subject to adjustment from time to time in a manner and upon terms as nearly
equivalent as practicable to the provisions of this Section 5.

        6. Fractional Interests.

        No fractional shares or scrip representing fractional shares shall be
issuable upon the Exercise of this Warrant, but on Exercise of this Warrant,
Holder may purchase only a whole number of shares of Common Stock. If, on
Exercise of this Warrant, Holder would be entitled to a fractional share of
Common Stock or a right to acquire a fractional share of Common Stock, such
fractional share shall be disregarded and the number of shares of Common Stock
issuable upon exercise shall be the next higher number of shares.

        7. Reservation of Shares.

        The Company shall at all times reserve for issuance such number of
authorized and unissued shares of Common Stock (or other securities substituted
therefor as herein above provided) as shall be sufficient for the Exercise of
this Warrant and payment of the Exercise Price. If at any time the number of
shares of Common Stock authorized and reserved for issuance is below the number
of shares sufficient for the Exercise of this Warrant and payment of the
Exercise Price (based on the Exercise Price in effect from time to time), the
Company will promptly take all corporate action necessary to authorize and
reserve a sufficient number of shares, including, without limitation, calling a
special meeting of stockholders to authorize additional shares to meet the
Company's obligations under this Section 7, in the case of an insufficient
number of authorized shares, and using its best efforts to obtain stockholder
approval of an increase in such authorized number of shares. The Company
covenants and agrees that upon the Exercise of this Warrant, all shares of
Common Stock issuable upon such exercise shall be duly and validly issued, fully
paid, nonassessable and not subject to preemptive rights, rights of first
refusal or similar rights of any person or entity.

        8. Restrictions on Transfer.

        (a) Registration or Exemption Required. This Warrant has been issued in
a transaction exempt from the registration requirements of the Act by virtue of
Regulation D and exempt from state registration under applicable state laws. The
Warrant and the Common Stock issuable upon the Exercise of this Warrant may not
be pledged, transferred, sold or assigned except pursuant to an effective
registration statement or an exemption to the registration requirements of the
Act and applicable state laws.

        (b) Assignment. If Holder can provide the Company with reasonably
satisfactory evidence that the conditions of (a) above regarding registration or
exemption have been satisfied, Holder may sell, transfer,



                                       6
<PAGE>

assign, pledge or otherwise dispose of this Warrant, in whole or in part. Holder
shall deliver a written notice to Company, substantially in the form of the
Assignment attached hereto as Exhibit B, indicating the person or persons to
whom the Warrant shall be assigned and the respective number of warrants to be
assigned to each assignee. The Company shall effect the assignment within ten
(10) days, and shall deliver to the assignee(s) designated by Holder a Warrant
or Warrants of like tenor and terms for the appropriate number of shares.

        9. Benefits of this Warrant.

        Nothing in this Warrant shall be construed to confer upon any person
other than the Company and Holder any legal or equitable right, remedy or claim
under this Warrant and this Warrant shall be for the sole and exclusive benefit
of the Company and Holder.

        10. Arbitration; Governing Law.

        This Agreement shall be governed by and construed in accordance with the
laws of the State of New York applicable to agreements made in and wholly to be
performed in that jurisdiction, except for matters arising under the Act or the
Securities Exchange Act of 1934, which matters shall be construed and
interpreted in accordance with such laws. Any controversy or claim arising out
of or related to the this Agreement or the breach thereof, shall be settled by
binding arbitration in New York, New York in accordance with the Expedited
Procedures (Rules 53-57) of the Commercial Arbitration Rules of the American
Arbitration Association ("AAA"). A proceeding shall be commenced upon written
demand by Company or any Lender to the other. The arbitrator(s) shall enter a
judgment by default against any party, which fails or refuses to appear in any
properly noticed arbitration proceeding. The proceeding shall be conducted by
one (1) arbitrator, unless the amount alleged to be in dispute exceeds two
hundred fifty thousand dollars ($250,000), in which case three (3) arbitrators
shall preside. The arbitrator(s) will be chosen by the parties from a list
provided by the AAA, and if they are unable to agree within ten (10) days, the
AAA shall select the arbitrator(s). The arbitrators must be experts in
securities law and financial transactions. The arbitrators shall assess costs
and expenses of the arbitration, including all attorneys' and experts' fees, as
the arbitrators believe is appropriate in light of the merits of the parties'
respective positions in the issues in dispute. Each party submits irrevocably to
the jurisdiction of any state court sitting in New York, New York or to the
United States District Court sitting in New York for purposes of enforcement of
any discovery order, judgment or award in connection with such arbitration. The
award of the arbitrator(s) shall be final and binding upon the parties and may
be enforced in any court having jurisdiction. The arbitration shall be held in
such place as set by the arbitrator(s) in accordance with Rule 55. With respect
to any arbitration proceeding in accordance with this section, the prevailing
party's reasonable attorney's fees and expenses shall be borne by the
non-prevailing party.

        Although the parties, as expressed above, agree that all claims,
including claims that are equitable in nature, for example specific performance,
shall initially be prosecuted in the binding arbitration procedure outlined
above, if the arbitration panel dismisses or otherwise fails to entertain any or
all of the equitable claims asserted by reason of the fact that it lacks
jurisdiction, power and/or



                                       7
<PAGE>

authority to consider such claims and/or direct the remedy requested, then, in
only that event, will the parties have the right to initiate litigation
respecting such equitable claims or remedies. The forum for such equitable
relief shall be in either a state or federal court sitting in New York, New
York. Each party waives any right to a trial by jury, assuming such right exists
in an equitable proceeding, and irrevocably submits to the jurisdiction of said
New York court. New York law shall govern both the proceeding as well as the
interpretation and construction of this Agreement and the transaction as a
whole.

        11. Loss of Warrant.

        Upon receipt by the Company of evidence of the loss, theft, destruction
or mutilation of this Warrant, and (in the case of loss, theft or destruction)
of indemnity or security reasonably satisfactory to the Company, and upon
surrender and cancellation of this Warrant, if mutilated, the Company shall
execute and deliver a new Warrant of like tenor and date.

        12. Notice or Demands.

        Notices or demands pursuant to this Warrant to be given or made by
Holder to or on the Company shall be sufficiently given or made if sent by
certified or registered mail, return receipt requested, postage prepaid, and
addressed, until another address is designated in writing by the Company, to the
address set forth in Section 2(a) above. Notices or demands pursuant to this
Warrant to be given or made by the Company to or on Holder shall be sufficiently
given or made if sent by certified or registered mail, return receipt requested,
postage prepaid, and addressed, to the address of Holder set forth in the
Company's records, until another address is designated in writing by Holder.

        IN WITNESS WHEREOF, the undersigned has executed this Warrant as of the
10th day of June, 2002.


                                     PATRIOT SCIENTIFIC CORP.


                                     By:     /S/ LOWELL W. GIFFHORN
                                         ---------------------------------------
                                     Lowell W. Giffhorn, Chief Financial Officer



                                       8
<PAGE>

                                    EXHIBIT A

                            EXERCISE FORM FOR WARRANT

                          TO: PATRIOT SCIENTIFIC CORP.

        The undersigned hereby irrevocably exercises the right to purchase
____________ of the shares of Common Stock (the "Common Stock") of Patriot
Scientific Corp., a Delaware corporation (the "Company"), evidenced by the
attached warrant (the "Warrant"), and herewith makes payment of the exercise
price with respect to such shares in full, all in accordance with the conditions
and provisions of said Warrant.

1. The undersigned agrees not to offer, sell, transfer or otherwise dispose of
any of the Common Stock obtained on exercise of the Warrant, except in
accordance with the provisions of Section 8(a) of the Warrant.

2. The undersigned requests that stock certificates for such shares be issued
free of any restrictive legend, if appropriate, and a warrant representing any
unexercised portion hereof be issued, pursuant to the Warrant in the name of the
undersigned and delivered to the undersigned at the address set forth below:

Dated:


--------------------------------------------------------------------------------
                                    Signature


--------------------------------------------------------------------------------
                                   Print Name


--------------------------------------------------------------------------------
                                     Address

--------------------------------------------------------------------------------

NOTICE

The signature to the foregoing Exercise Form must correspond to the name as
written upon the face of the attached Warrant in every particular, without
alteration or enlargement or any change whatsoever.


--------------------------------------------------------------------------------



                                       9
<PAGE>

                                    EXHIBIT B

                                   ASSIGNMENT

                    (To be executed by the registered holder
                        desiring to transfer the Warrant)

FOR VALUE RECEIVED, the undersigned holder of the attached warrant (the
"Warrant") hereby sells, assigns and transfers unto the person or persons below
named the right to purchase _______ shares of the Common Stock of Patriot
Scientific Corp., evidenced by the attached Warrant and does hereby irrevocably
constitute and appoint _______________________ attorney to transfer the said
Warrant on the books of the Company, with full power of substitution in the
premises.

Dated:
      ------------                           -----------------------------------
                                             Signature


Fill in for new registration of Warrant:


-----------------------------------------
               Name

-----------------------------------------
               Address

-----------------------------------------
Please print name and address of assignee
(including zip code number)


-----------------------------------------------------------------------

NOTICE

The signature to the foregoing Assignment must correspond to the name as written
upon the face of the attached Warrant in every particular, without alteration or
enlargement or any change whatsoever.



                                       10