Jeffrey Wolfson

The Federal Circuit issued its long-awaited decision in Google LLC v. Sonos, Inc. on August 28, 2025,  providing guidance on the doctrine of prosecution laches. As the first U.S. Court of Appeals for the Federal Circuit decision on prosecution laches for a patent issued after 1995—when patent terms changed from 17-years-from issuance to 20-years-from filing—some suspected the Federal Circuit might definitively end the prosecution laches doctrine. Although prosecution laches remains a valid equitable defense, the Federal Circuit placed significant limitations on its applicability.