definiens: shall mean ( a ) a claim of an issued, unexpired patent which has not been withdrawn, cancelled, abandoned, disclaimed, revoked or held unenforceable or invalid by an unappealable decision, or an appealed decision where the appeal has been pending for more than two years ( unless and until such decision is subsequently overturned on appeal ), of a court or governmental agency of competent jurisdiction and which has not been disclaimed, denied, or admitted to be invalid or unenforceable through reissue, disclaimer or similar formal action, or ( b ) a claim ofa pending patent application, unless such claim has not issued as a claim of an issued patent within six ( 6 ) years after the filing date from which such claim takes priority, in which 10 [ * 1 [ * ] [ * 1 [ * ] [ * ) [ * 1 [ * 1 [ * 1 case such claim shall cease to be a Valid Claim unless and until such claim becomes a claim of an issued patent