Mealey's (June 9, 2016, 12:13 PM EDT) -- ALEXANDRIA, Va. — Efforts by Arista Networks Inc. to invalidate a single claim of a Cisco Systems Inc. patent were unsuccessful on June 6, when the Patent Trial and Appeal Board (PTAB) denied a petition for inter partes review (IPR) (Arista Networks Inc. v. Cisco Systems Inc., No. IPR2016-00304, PTAB)....