The US Patent & Trademark Office officially published Apple's latest trademark filing for "Touch ID," which was filed earlier in the week. For those unfamiliar with Apple's Touch ID, it's a fingerprint recognition feature, that's currently available on the seventh generation of iPhone, the iPhone 5S. Touch ID is heavily integrated into iOS 7 allowing users to unlock their phone, as well as make purchases in the various Apple digital media stores. Apple's Vice President of Marketing Phil Schiller announced the new Touch ID feature at Apple's iPhone media event on September 10, 2013. It's fully expected that Apple's Touch ID security feature will be integrated into additional hardware beyond the iPhone 5S sometime later this year. Report Updated at 1:15 PM PST.