In CELGENE CORPORATION v. PETER, the Federal Circuit recently affirmed the PTAB’s decisions finding appealed claims obvious. However, more importantly, the Federal Circuit also held that the retroactive application of IPR proceedings to pre-AIA patents is not an unconstitutional taking under the Fifth Amendment.

Regarding the constitutional issue of whether the retroactive application of IPRs to pre-AIA patents is an unconstitutional taking, the Federal Circuit noted that The Supreme Court left open this challenge with
the following passage near the end of its decision in Oil States Energy Servs., LLC v. Greene’s Energy Grp., LLC, 138 S. Ct. 1365, 1379 (2018) as follows:
Continue Reading Federal Circuit Holds IPR Proceedings on Pre-AIA Patents is Not an Unconstitutional Taking Under the Fifth Amendment