Assignor estoppel is an equitable doctrine that prevents a party who assigns a patent to another from later challenging the validity of the assigned patent. As reported in a prior post, the Federal Circuit recently stated...more
Federal Circuit Summary - Before Prost, Schall, and Chen. Appeal from the Patent Trial and Appeal Board. Summary: The plain language of 35 U.S.C. § 311(a) unambiguously leaves no room for assignor estoppel to apply in...more