Global Health Solutions LLC, v. Marc Selner, No. 2023-2009 (Fed. Cir. (PTAB) Aug. 26, 2025). Opinion by Stark, joined by Stoll and Goldberg. “This case marks [the Federal Circuit’s] first review of an AIA derivation...more
In Google v. Sonos, the Federal Circuit soundly disposed of arguments that the patent-in-suit was unenforceable due to laches based on an “unreasonable delay” in patent prosecution. Does the court’s reasoning foreclose the...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
A recent district court decision in Sonos v. Google has set forth a novel application of the prosecution laches doctrine to a patent with a post-1995 priority date. Sonos Inc. v. Google LLC, 20-06754 WHA, 2023 WL 6542320...more
The Supreme Court recently declined to review Personalized Media Communications, LLC v. Apple Inc., where a divided panel of the Federal Circuit upheld the district court’s finding that a PMC patent is unenforceable due to...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
HYATT v. HIRSHFELD - Before Reyna, Wallach, and Hughes. Appeal from the United States District Court for the District of Columbia. Summary: The PTO met its burden to prove prosecution laches for bulk-filed patent...more