Whether retroactive application of inter partes review to patents issued before passage of the America Invents Act violates the Takings Clause of the Fifth Amendment

QUESTION PRESENTED When Congress passed the America Invents Act (AIA) in 2011, it created a new administrative proceeding called “inter partes review” for reviewing the validity of previously issued patents. See LeahySmith America Invents Act, Pub. L. No. 112-29, § 6, 125 Stat. 284, 299-313 (2011). In the same Act, Congress created the Patent Trial and Appeal Board, a new administrative tribunal for conducting inter partes review. Id. § 7. That Board, now numbering 270-plus “administrative patent judges,” was given the retroactive power to cancel patent rights conferred prior to enactment of the AIA, “even though that procedure was not in place when [those patents] issued.” Oil States Energy Servs., LLC v. Greene’s Energy Group, LLC, 138 8. Ct. 1365, 1379 (2018). In just its first four years, the Board invalidated more than 16,600 patent claims, most of which were likely issued before inter partes review was enacted. This case presents a question expressly left open in Oil States: Whether retroactive application of inter partes review to patents issued before passage of the America Invents Act violates the Takings Clause of the Fifth Amendment.