Samsung's involvement isn't entirely selfless. The Korean giant was also accused of infringing the same technology, moving it to persuade the USPTO to review the validity of the patents in the first place. Apple still faces a review of the other two patents, verdicts for which should arrive on April 4 and May 30. Only then will we know if the iPhone-maker needs to issue a payout, and for how much. For Apple's part, it not only claims the patents are invalid, but that it doesn't even use the techniques they cover. SmartFlash, which makes its money licensing patents, can challenge the USPTO's decision.