( August 4, 2025, 1:58 PM EDT) -- WASHINGTON, D.C. — The full Federal Circuit U.S. Court of Appeals on Aug. 1 denied Groupon Inc.’s petition for either en banc or panel rehearing, rejecting the company’s contention that an appeals court panel erred when it held that a patent owner’s infringement claims in a Delaware federal court were not estopped by a previous decision by the U.S. Patent Trial and Appeal Board (PTAB); in a dissenting opinion, two circuit judges said that the opinion cannot be squared with the circuit’s precedent....