In September, a pair of inter partes reviews (IPRs) filed by Apple against patents held and asserted by Parus Holdings, Inc. left all challenged claims standing. However, this past week the Patent Trial and Appeal Board (PTAB) nixed claims from the same two patents, this time challenged in petitions filed jointly by Alphabet (Google), LG Electronics (LGE), and Samsung. Key to these final written decisions were Parus’s failures to adequately push certain invention dates back and to find support in earlier written descriptions for later claims, each failure expanding the universe of prior art available to the petitioners. Meanwhile, in district court a few days earlier, Parus sued Samsung (6:21-cv-01073) for a second time over patents from the same family.