The US Court of Appeals for the Federal Circuit affirmed a district court’s judgment for the US Patent & Trademark Office (PTO) on application of prosecution laches in an action under 35 USC § 145. The Federal Circuit also...more
In October 2023, we reported on the district court decision in Sonos, Inc. v. Google LLC. The decision was notable for reviving the prosecution laches doctrine to render unenforceable a continuation patent filed 13 years...more
The Federal Circuit’s recent decision in Google LLC v. Sonos, Inc. (24-1097) offers a compelling look at the evolving doctrine of prosecution laches, the written description requirement, and the practical realities of patent...more
Global Health Solutions LLC v. Selner, Appeal No. 2023-2009 (Fed. Cir. Aug. 26, 2025) - In our Case of the Week, the Federal Circuit conducted its first review of a derivation proceeding under the America Invents Act that...more
Addressing for the first time whether the US Patent & Trademark Office (PTO) can assert prosecution laches as a defense in a civil action brought under 35 U.S.C. §145, the US Court of Appeals for the Federal Circuit held that...more
Gilbert P. Hyatt v. Andrew Hirshfeld, Appeal Nos. 2018-2390, -2391, -2392, 2019-1038, -1039, -1049, -1070 (Fed. Cir. June 1, 2021) - This week’s Case of the Week explores a long-running dispute between controversial...more