(May 15, 2018, 12:42 PM EDT) -- ALEXANDRIA, Va. — A patented tubular seat and tubular actuating system for use in oil and gas fracturing is rendered obvious and anticipated by various prior art, according to a May 10 petition for inter partes review filed with the Patent Trial and Appeal Board (Packers Plus Energy Services Inc. v. Baker Hughes Oilfield Operations LLC, No. IPR2018-01030, PTAB)....