definiens: means Improvements which are conceived, developed or reduced to pract ice during the term of this Agreement, either during the performance of the Research Program or during subsequent development, commercialization, marketing and manufacturing of Material and/or Products, solely by employees or contractors acting on behalf o f PMC or its Affiliates, to the extent that PMC has now or hereafter shall have the right to grant licenses, immunities or other rights thereon ; ( ww ) means any and all products used in the Field of Use which utilize any or are based on any CORIXA Technology, PMC Improvements or Joint Inventions, which means that the manufacture, sale or use of such Products would have constituted a misappropriation of substantial Licensed Know -How, Material or CORIXA Improvements and/or an infri ngement of the Licensed Patents but for the licenses granted in this Agreement ; ( x ) means, with respect to any Products in each country in the Territory, the period of time equal to the longer of ( a ) [ * * * ] from the date of First Commercial Sale of a Product in such country or ( b ) the term for which a Valid Patent Claim in such country remains in effect and, but for a license granted by this Agreement, would be infringed by the manufacture, use or sale of such Product in the Field of Use in such country ; ( xx ) means any person acting pursuant to a sublicense granted to it by PMC or its Affiliates under the terms of this Agreement ; ( y ) means all countries in the world ; ( yy ) means any person other than PMC, CORIXA and their respective Affiliates ; ( z ) means a claim of an issued and unexpired patent or patent application included in Licensed Patents or those PMC Research Patents having a subject matter on Improvement which has not been held permanently revoked, unenforceable or invalid by a decision of a court or other governmental agency of competent jurisdiction, unappealable or un appealed within the time allowed for appeal, and which has not been admitted to be invalid or unenforceable through reissue or disclaimer or otherwise