(Reuters) – BlackBerry Ltds patent claims related to an attachable keyboard accessory for Apple Incs iPhones dont 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 Apples iPhone models infringes patents. The Canadian smartphone maker claimed that Typos keyboard infringes its design and alleged that the startups $99 keyboard featuring angled miniature keys is similar to those on many BlackBerry devices. In a request to a federal court in San Francisco, Typo asked a U.S. judge to rule that the patents have not been infringed and to declare some of the claims invalid and unenforceable.