On November 11, 2017, Pfizer, Inc. filed a petition for inter partes review (IPR) of Biogen and Genentech’s US Patent No. 8,545,843, which relates to a method of treating vasculitis with rituximab. (IPR2018-00086.) On May 31, 2018, the PTAB denied institution of this IPR. Separately, on June 4, 2018, Pfizer filed…