(October 11, 2018, 12:32 PM EDT) -- ALEXANDRIA, Va. — In an Oct. 5 petition for inter partes review (IPR), social media giant Facebook Inc. tells the Patent Trial and Appeal Board that a patented visual index for a graphical search engine would be obvious to a person of skill in the art (Facebook Inc. v. Hyper Search LLC, No. IPR2019-00041, PTAB)....