Blackberry's keyboard patent claims called invalid

BlackBerry Ltd's patent claims related to an attachable keyboard accessory for Apple Inc's iPhones don't comply with legal requirements for patentability, Typo Products LLC said in a court filing late on Tuesday. BlackBerry sued Typo last month, saying its physical keyboard that can be attached to some of Apple's iPhone models infringes patents.
Background:
Typo Products tells U.S. judge BlackBerry's patent claims are invalid [Reuters]