The Federal Circuit has largely upheld an invalidity ruling for Cisco against a patent asserted by VirnetX, Inc. throughout its long-running litigation campaign. On June 28, the court reversed the invalidation of three claims cancelled in a Cisco inter partes reexamination, ruling that the Patent Trial and Appeal Board (PTAB) had erred by not considering certain arguments and by not making certain factual findings. It therefore remanded the case for further consideration of those claims (2018-1751), after affirming the PTAB’s invalidation of 33 other claims from the same patent, finding no reversible error in that portion of the Board’s analysis. The affected patent has been asserted in multiple VirnetX cases that have gone to trial, including one that led to a 2013 noninfringement verdict as to Cisco and several verdicts involving Apple, some of which have been overturned amidst an ongoing appellate battle between Apple and the NPE.