Mealey's (September 5, 2019, 3:40 PM EDT) -- ALEXANDRIA, Va. — In a Sept. 4 holding, the Patent Trial and Appeal Board found that Facebook Inc. and two co-petitioners showed a reasonable likelihood that they will prevail in establishing that at least one claim of a Blackberry Limited patent directed to silencing message threads is unpatentable (Facebook Inc., et al. v. Blackberry Limited, No. IPR2019-00706, PTAB)....