Mealey's (November 19, 2021, 10:12 AM EST) -- WASHINGTON, D.C. — In a Nov. 18 holding, the Federal Circuit U.S. Court of Appeals directed the Patent Trial and Appeal Board to revisit its determination of nonobviousness as it relates to the only two claims of a voice over Internet protocol (VoIP) patent to survive an inter partes review (IPR) initiated by Facebook Inc. and WhatsApp Inc....