Federal Circuit In March: IPR And The Limits Of Retroactivity
Law360, Sean Murray & Jeremiah Helm, April 30, 2026
The U.S. Court of Appeals for the Federal Circuit addressed the limits of retroactivity in its recent decision,
Implicit LLC v. Sonos Inc. There the court considered Implicit's attempt to erase a loss in inter partes review proceedings by retroactively correcting the two invalidated patents. The Federal Circuit ruled that, even though the retroactive correction theoretically should have changed the outcome of the IPRs, thereby saving Implicit's patents from invalidation, Implicit had forfeited the right to rely on the correction.