To amend title 35, United States Code, to provide for appeals by third parties in certain patent reexamination proceedings.

Amends Federal patent law with respect to appeals in inter partes reexamination proceedings to allow a third-party requester to: (1) appeal to the U.S. Court of Appeals for the Federal Circuit, with respect to any final decision favorable to the patentability of any original or proposed amended or new claim of the patent; and (2) be a party to any appeal taken by the patent owner, subject to the estoppel to assert at a later time in any civil action the invalidity of any claim finally determined to be valid and patentable on any ground which he or she raised or could have raised during such proceeding.

Allows a third-party requester to appeal a decision of the Board of Patent Appeals and Interferences.

Provides that a third-party requester in an inter partes reexamination proceeding dissatisfied with the final decision in an appeal to the Board may appeal the decision only to the U.S. Court of Appeals for the Federal Circuit.