definiens: shall mean all United States and foreign patents and patent applications and any divisions, continuations, continuations in part, reissues, reexaminations, renewals and extensions thereof, a nd all pending applications therefor ( a ) which are set forth on Appendix A, or ( b ) which claim inventions that are related to IL -1b or derivatives, mutants, variants, fragments, antibodies, assays or chemical analogs thereof, and which are conceived or reduced to practice in whole or in part by ( i ) employees, agents or contractors of CISTRON during the term of this Agreement and/or ( ii ) which are licensed to CISTRON, and/or ( c ) which are derived in whole or in part from material, information or data pr oprietary to CISTRON, provided by CISTRON to R&D and reduced to writing by either party within thirty ( 30 ) days of transfer and the receipt of which is acknowledged in writing by R&D