Since the Supreme Court upheld the constitutionality of inter partes review (IPR) a little more than a year ago in Oil States, several patent owners have brought other constitutional challenges to America Invents Act (AIA) trial proceedings. These cases have been slowly percolating at the Patent Trial and Appeal Board (PTAB), the U.S. Court of Federal Claims, and the U.S. Court of Appeals for the Federal Circuit. In many cases, however, the Federal Circuit has declined to address these constitutional claims on the merits, finding them unnecessary to resolve or insufficiently developed by the parties. But early last week, the Federal Circuit for the first time addressed the applicability of the Takings Clause of the Fifth Amendment to IPRs, holding in Celgene Corp. v. Peter, Case No. 18-1167 (Fed. Cir. 2019) “that the retroactive application of IPR proceedings to pre-AIA patents is not an unconstitutional taking under the Fifth Amendment.” While the court’s holding may appear on its face to forestall current and future Takings Clause challenges to AIA proceedings, its analysis leaves some questions unanswered, and may even provide a narrow path forward for future takings claims. Furthermore, given the Supreme Court’s predilection for addressing both AIA and Takings Clause issues, the Federal Circuit panel’s decision may not be the last word on this interesting issue.
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