In Comcast Cable Communications, LLC v. Promptu Systems Corp., 1 the Federal Circuit held that the plain meaning of the claim phrase “command function” was limited to functions that command an action to be taken. The meaning of this claim phrase turned out to be a focal point, and Comcast lost its invalidity challenge to the claims as a result of this interpretation. Comcast filed a petition for inter partes review (IPR) of U.S. Patent No. 7,260,538 (the ’538 patent) on the grounds that the contested claims would have been obvious in view of two prior art references—U.S. Patent No. ...