(January 3, 2018, 1:38 PM EST) -- ALEXANDRIA, Va. — In a series of petitions for inter partes review (IPR) filed since November, Snap Inc. has fired back at a patent owner that accused the social media giant of infringement in a California federal complaint last year; in one petition, filed Dec. 29, Snap asserts that six claims of one of the patents would have been obvious over a combination of prior art (Snap Inc. v. VaporStream Inc., No. IPR2018-00408, PTAB)....