Document:

PATENT ASSIGNMENT AGREEMENT

THIS PATENT ASSIGNMENT  AGREEMENT  ("Agreement") is entered as of the 1st day of
May 2006  ("EFFECTIVE  DATE") by and  between  WORLD  WASTE  TECHNOLOGIES,  with
offices at 13520  Evening  Creek Drive  North,  Suite 130,  San Diego,  CA 92128
("WWT"),  and The  University  of Alabama in  Huntsville.,  with  offices at 301
Sparkman Drive NW, Huntsville, AL 35805 ("UAH").

WHEREAS,  UAH owns United States Patent No. 6,306,248 (the "PATENT") and desires
to assign all right, title and interest in and to the Patent to WWT; and

WHEREAS,  WWT desires to accept assignment of the Patent in accordance with this
terms and conditions of this Agreement;

NOW THEREFORE,  in  consideration  of the premises and mutual  covenants  herein
contained, WWT and UAH agree as follows:

1.    ASSIGNMENT.

1.1   UAH hereby  assigns  to WWT  exclusively  throughout  the world all right,
      title and interest (whether or not now existing) in and to: (a) the Patent
      and all associated  patent rights,  domestic and foreign,  (b) all related
      domestic and foreign  patent  applications  (and any  resulting  patents),
      patent  disclosures,  reissuances,  continuations,  continuations-in-part,
      divisionals,  revisions,  extensions,  and reexaminations thereof, (c) all
      accompanying  worldwide  intellectual and industrial  property rights, and
      (d) all right,  title and  interest UAH has in and to all causes of action
      and enforcement  rights,  if any,  whether  currently  pending,  filed, or
      otherwise,  for the Patent,  including without  limitation,  all rights to
      pursue damages, injunctive relief and other remedies for past, current and
      future  infringement  of the  Patent  (subsection  (a),  (b)  (c)  and (d)
      collectively the "INTELLECTUAL PROPERTY") (the "Assignment").  The parties
      hereto  intend  that the  Assignment  shall  be  subject  to all  existing
      licenses to the Intellectual  Property  properly  reviewed and approved by
      UAH as of the date hereof but only if listed on Schedule 4 hereto and that
      WWT will assume those licensed  specifically  set forth on Schedule 4. UAH
      hereby  represents  and warrants that UAH has provided WWT with all files,
      agreements and other writings  relating to the existing licenses listed on
      Schedule 4 attached  hereto.  UAH also  hereby  assigns to WWT all current
      claims for payment  from  Bio-Products  International  ("BPI") to UAH. UAH
      also assigns to WWT all information,  trade secrets, know-how,  technology
      and  accompanying  intellectual  property  rights,  developed  by UAH, its
      employees,  contractors  and  licensees,  related  to, or covered  by, the
      Intellectual  Property.   Other  than  as  expressly  set  forth  in  this
      Agreement, UAH retains no rights whatsoever in the Intellectual Property.

1.2   In the event WWT (a)  becomes  the  subject of any  voluntary  petition in
      bankruptcy   or  any   voluntary   proceeding   relating  to   insolvency,
      receivership, liquidation, or composition for the benefit of creditors; or
      (b) becomes the subject of an  involuntary  petition in  bankruptcy or any
      involuntary proceeding relating to insolvency, receivership,  liquidation,
      or  composition  for  the  benefit  of  creditors,  if  such  petition  or
      proceeding  is not  dismissed  within sixty (60) days of filing,  whatever
      Intellectual  Property  owned  by WWT at the  time  of  such  event  shall
      automatically  be assigned to UAH, subject to any licenses granted therein
      by WWT.

2.    PAYMENTS.

2.1   License. In consideration of the Assignment conveyed in Section 1.1 above,
      WWT shall (i) pay to UAH a one-time  assignment fee of $100,000 payable in
      two installments; the first installment of $20,000 shall be payable on the
      Effective  Date, the second  installment for the balance of funds shall be
      paid on or before December 31, 2007 (the "Cash  Consideration"),  and (ii)
      within  fifteen  days after the date this  assignment  is executed by UAH,
      issue to UAH, or its designee,  167,000  shares of WWT's common stock (the
      "Equity  Consideration"),  in accordance  with this Section 2 ("ASSIGNMENT
      FEE").

2.2   Claims. To the extent any collections are made by WWT on existing payments
      due to UAH from BPI  described in Section 1.1 above,  WWT shall notify UAH
      of the collection and immediately pay to UAH 50% of the amount of all such
      payments after deducting  documented  legal fees or collection  costs. Any
      such  legal  fees,   collection   costs  or  other   deductions  shall  be
      specifically itemized by WWT for review and approval by UAH.

                                   PAGE 1 OF 4                      CONFIDENTIAL

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2.3   Payment  Terms.  WWT  shall  pay the  Cash  Consideration  to UAH,  or its
      designee,  in two  installments;  first for $20,000 on the Effective Date,
      and  second for  $80,000 on or before  December  31,  2007 at the  address
      indicated  below.  The  Equity  Consideration  issuable  to  UAH,  or  its
      designee,  shall be  167,000  common  shares.  In  addition  to all  other
      remedies  available  to UAH at law or in  equity,  subject  to the  limits
      imposed by any  applicable  usury law,  interest  shall accrue on payments
      made more than ten (10) days  after  they are due at the rate of  eighteen
      percent (18%) per annum, compounded daily, from the due date until paid.

3.    FURTHER ASSURANCES.  UAH agrees to promptly assist WWT in every proper way
      to evidence, record and perfect the Section 1.1 assignment and to promptly
      apply for and obtain recordation of and from time to time secure, enforce,
      maintain,  and defend the assigned rights. If WWT is unable for any reason
      whatsoever  to secure UAH's  signature  to any  document  requested by WWT
      under this Section 3, UAH hereby  irrevocably  designates and appoints WWT
      and  its  duly  authorized  officers  and  agents,  as  UAH's  agents  and
      attorneys-in-fact,  coupled  with an  interest  and  with  full  power  of
      substitution,  to act for and on  UAH's  behalf  and  instead  of UAH,  to
      execute  and file any  such  document  or  documents  and to do all  other
      lawfully  permitted acts to further the purposes of the foregoing with the
      same legal force and effect as if executed by UAH.

4.    NON-AGGRESSION.  UAH shall not at any time, directly or indirectly, oppose
      the grant of, nor dispute the validity or enforceability of, nor cooperate
      in any way in any suit, claim,  counterclaim or defense against any patent
      or claim included in the Intellectual Property.

5.    WARRANTY.

5.1   UAH  represents  and warrants to WWT that UAH (a) is the sole owner (other
      than WWT) of all rights, title and interest in the Intellectual  Property,
      (b) except as listed on Schedule 5 as attached  hereto,  has not assigned,
      transferred,   licensed,  pledged  or  otherwise  encumbered  any  of  the
      Intellectual Property or agreed to do so, (c) has full power and authority
      to enter into this  Agreement  and to make the  assignment  as provided in
      Section  1.1,  (d)  is  not  aware  of  any  violation,   infringement  or
      misappropriation of any third party's rights (or any claim thereof) by the
      Intellectual Property, and (e) is not aware of any questions or challenges
      with  respect  to the  patentability  or  validity  of any  claims  of any
      existing  patents  or patent  applications  relating  to the  Intellectual
      Property.

5.2   EXCEPT AS PROVIDED IN PARAGRAPH 5.1, (i) UAH DOES NOT REPRESENT OR WARRANT
      THE  PATENTABILITY  OF ANY CLAIMED  INVENTION  IN, OR THE  VALIDITY OF ANY
      PATENT; (ii) UAH DOES NOT REPRESENT OR WARRANT THAT THE MANUFACTURE,  USE,
      SALE, OFFERING FOR SALE, IMPORTATION, EXPORTATION OR OTHER DISTRIBUTION OF
      ANY  PRODUCT OR METHOD  DISCLOSED  AND  CLAIMED IN ANY PATENT BY UAH,  ANY
      LICENSEE  OR ANY  SUBLICENSEE  OR  ANYONE  ELSE  SHALL NOT  CONSTITUTE  AN
      INFRINGEMENT OF THE INTELLECTUAL  PROPERTY RIGHTS OF OTHERS; AND (iii) UAH
      DOES NOT MAKE ANY  REPRESENTATIONS,  OR EXTEND ANY WARRANTIES OF ANY KIND,
      EITHER  EXPRESS OR  IMPLIED,  WITH  RESPECT TO ANY PATENT OR ANY  PRODUCT,
      INCLUDING BUT NOT LIMITED TO THE IMPLIED  WARRANTIES OF MERCHANTABILITY OR
      FITNESS FOR A PARTICULAR PURPOSE.

6.    INDEMNIFICATION.  WWT  shall  defend  (with  legal  counsel  selected  and
      retained by WWT), indemnify and hold harmless the Board of Trustees of the
      University of Alabama, UAH, its directors, officers, employees, agents and
      their respective successors, assigns and heirs ("INDEMNITEES") against any
      and all  claims,  suits and legal  actions by any third  party  (including
      without limitation any current licensees listed on Schedule 5) ("CLAIMS"),
      based  upon  any  theory  of  liability  (including,  without  limitation,
      warranty,  strict  liability or tort),  arising out of the exercise of any
      rights under this Agreement to the Patent by WWT or any of its affiliates,
      successors or assigns,  or by any  sublicensee  of WWT, all subject to the
      following:

6.1   Indemnitees  shall  give  WWT  written  notice  of  the  Claim  which  any
      Indemnitee  desires WWT to defend,  indemnify and hold harmless under this
      Agreement  promptly after any Indemnitee receive notice thereof along with
      sufficient  information for WWT to identify the Claim. WWT shall have sole
      control of the defense and/or  settlement of all Claims,  and  Indemnitees
      shall not settle or  compromise  any such Claim  without the prior written
      consent of WWT.  Indemnitees  shall  cooperate and provide such assistance
      (including,  without  limitation,  testimony  and access to  documentation
      within the possession or control of any  Indemnitee) as WWT may reasonably
      request in connection with WWT's defense,  settlement and  satisfaction of
      the Claim.

                                   PAGE 2 OF 4                      CONFIDENTIAL

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6.2   As part of  WWT's  obligation  to  defend,  indemnify  and  hold  harmless
      Indemnitees,  WWT shall pay any and all (i) costs and expenses  reasonably
      incurred by WWT in connection with the defense, settlement or satisfaction
      of any Claim (including,  without limitation, any amounts agreed to by WWT
      in settlement  of the Claim) and (ii) amounts  required by any judgment or
      order of any court to be paid by  Indemnitees  as damages or other  relief
      based upon the Claim;  provided that  Indemnitees have complied with their
      obligations under (a) above with respect to the Claim.

6.3   WWT shall not be obligated  under this Section 6 with respect to any Claim
      or related costs and  expenses,  if and to the extent the Claim arises out
      of or is  related  to any  breach  of this  Agreement  by UAH  (including,
      without limitation, any breach of UAH's representations and warranties set
      forth in Section 5).

6.4   Except as specifically  provided in 6.1 and 6.2 above,  WWT shall not have
      any  obligation  to pay or  reimburse  any costs or  expenses  (including,
      without limitation,  any fees or expenses of any legal counsel retained by
      any Indemnitee), unless otherwise agreed in writing by WWT.

6.5   Notwithstanding  anything to the contrary in this  Agreement or otherwise,
      WWT's maximum cumulative liability for all Claims and all causes of action
      for which WWT would be required to  indemnify  under this  Section 6 shall
      not exceed $1,000,000.

7.    MISCELLANEOUS. WWT agrees to feature UAH as its primary technology partner
      in WWT's  collateral  materials,  website and other  communications  after
      review  and  approval  by  UAH.  This   Agreement  is  not  assignable  or
      transferable, by operation of law, merger, acquisition,  reorganization or
      otherwise, by UAH without the prior written consent of WWT; any attempt to
      do so shall be void. Any notice,  report,  approval or consent required or
      permitted  hereunder  shall be in writing  and will be deemed to have been
      duly given if delivered personally,  mailed by first-class,  registered or
      certified U.S. mail, postage prepaid,  or by traceable express courier, to
      the respective  addresses of the parties as set forth above (or such other
      address as a party may designate by ten (10) days notice).  This Agreement
      shall not be  construed  against  the  party  preparing  it,  but shall be
      construed  as if all  parties  jointly  prepared  this  Agreement  and any
      uncertainty or ambiguity shall not be interpreted  against any party.  The
      language of all parts of this  Agreement  shall in all cases be  construed
      simply,  according to fair meaning, and not strictly for or against any of
      the parties hereto.  The paragraph  headings in this Agreement are for the
      convenience of the parties only and shall not affect the  construction  or
      interpretation of this Agreement.  No failure to exercise, and no delay in
      exercising,  on the part of either party, any privilege,  any power or any
      rights hereunder will operate as a waiver thereof,  nor will any single or
      partial exercise of any right or power hereunder preclude further exercise
      of any other right hereunder.  If any provision of this Agreement shall be
      adjudged by any court of competent  jurisdiction  to be  unenforceable  or
      invalid,  that  provision  shall be limited or  eliminated  to the minimum
      extent  necessary so that this Agreement  shall  otherwise  remain in full
      force and effect and  enforceable.  This Agreement shall be deemed to have
      been made in, and shall be construed  pursuant to the laws of the State of
      Alabama  and  the  United  States  without  regard  to  conflicts  of laws
      provisions  thereof.  The  prevailing  party in any action to enforce this
      Agreement  shall be  entitled  to recover  costs and  expenses  including,
      without  limitation,  attorneys'  fees. Any waivers or amendments shall be
      effective  only if made in writing and signed by a  representative  of the
      respective parties authorized to bind the parties. Both parties agree that
      this  Agreement  is the  complete  and  exclusive  statement of the mutual
      understanding  of the parties  and  supersedes  and  cancels all  previous
      written and oral  agreements  and  communications  relating to the subject
      matter of this Agreement.

IN WITNESS WHEREOF, the parties have executed this Agreement on the day and year
first indicated above.

UNIVERSITY OF ALABAMA IN HUNTSVILLE               WORLD WASTE TECHNOLOGIES, INC.

By: /s/ Lawrence R. Greenwood                     By: /s/ John Pimentel
    ------------------------------                ------------------------------

Print Name: Lawrence R. Greenwood, Ph.D.          Print Name: John Pimentel
                                                              ------------------

Title: Vice President for Research                Title: Chief Executive Officer
                                                         -----------------------

                                   PAGE 3 OF 4                      CONFIDENTIAL

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                                   SCHEDULE 5

                                EXISTING LICENSES

Amended and Restated License  Agreement with Bio-Products  International,  Inc.,
dated August 13, 2004 (copy attached.

All  other   agreements   are   Sublicense   Agreements   between   Bio-Products
International, Inc. and various companies.

                                   PAGE 4 OF 4                      CONFIDENTIALASSIGNMENT OF PATENT

      This Assignment is made this 1st day of May, 2006,  between THE UNIVERSITY
OF ALABAMA IN  HUNTSVILLE,  with offices at 301 Sparkman  Drive NW,  Huntsville,
Alabama 35805 USA ("Assignor") and WORLD WASTE TECHNOLOGIES,  INC., a California
corporation  with its  principal  place of business at 13520 Evening Creek Drive
North, Suite 130, San Diego, California 92128 USA ("Assignee").

      WHEREAS,  Assignor  is the sole  owner and record  title  holder of United
States Patent No. 6,306,248 (the "Patent"); and

      WHEREAS,  Assignee is desirous of acquiring  the entire  right,  title and
interest in and to, and record title of, the Patent; and

      WHEREAS,  Assignor has agreed to sell, convey and assign the entire right,
title and  interest  in and to the Patent to Assignee  pursuant to the  separate
patent assignment agreement attached hereto as Exhibit A.

      NOW,  THEREFORE,  in  consideration  of good and  valuable  consideration,
receipt  whereof by  Assignor is hereby  acknowledged,  Assignor  hereby  sells,
assigns and transfers  unto Assignee,  its  successors  and assigns,  its entire
right, title and interest in and to the Patent and all associated patent rights,
domestic and foreign,  and all related domestic and foreign patent  applications
(and any resulting patents), including all continuations,  divisions, revisions,
extensions,  reissues  and  reexaminations  thereof,  the  inventions  described
therein,  all patents and patent applications which claim priority of any of the
Patent; together with all rights to profits,  royalties and damages for past and
future  infringement  of the  Patent by any party and all  rights to sue for and
collect such profits,  royalties and damages; the same to be held and enjoyed by
Assignee for its own use and behoof,  and for its  successors  and  assigns,  as
fully  and  entirely  as the same  would  have been  held by  Assignor  had this
assignment and sale not been made.

      EXECUTED  this  1st  day of May,  2006 at The  University  of  Alabama  in
Huntsville, 301 Sparkman Drive NW, Huntsville, AL 35805 USA.

                                        ASSIGNOR:
                                        THE UNIVERSITY OF ALABAMA IN HUNTSVILLE

                                        Signature: /s/ Lawrence R. Greenwood
                                                   ----------------------------
                                        By:  Lawrence R. Greenwood, Ph.D.

                                        Its: Vice President for Research
STATE OF ALABAMA)

COUNTY OF MADISON) SS:

Before me on this 1st day of May, came Lawrence R. Greenwood, to me known to be
the person named in the foregoing assignment and that the execution thereof is
acknowledged to be his\her free act and deed.

                                                   /s/ Kerry Short Elmore
                                                   -----------------------------
     Seal                                               (Notary Public)

<PAGE>

                                    EXHIBIT A
                                    ---------

                           PATENT ASSIGNMENT AGREEMENT

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