(December 1, 2017, 8:28 AM EST) -- ALEXANDRIA, Va. — A patented immunogenic composition would have been obvious to a person of skill in the art, Sanofi Pasteur Inc. and SK Chemicals Co. Ltd. (Sanofi, collectively) assert in a Nov. 20 petition for inter partes review by the Patent Trial and Appeal Board (Sanofi Pasteur Inc. and SK Chemicals Co. Ltd. v. Pfizer Inc., No. IPR2018-0187, PTAB)....