(February 22, 2018, 3:16 PM EST) -- WASHINGTON, D.C. — Palo Alto Networks Inc. recently told the Federal Circuit U.S. Court of Appeals that the Patent Trial and Appeal Board erred in determining that three claims of a computer security patent are nonobvious under Section 103 of the Patent Act, 35 U.S.C. § 103. (Palo Alto Networks Inc. v. Symantec Corp., Nos. 17-2034, -2047, Fed. Cir.)....