Late last week, we highlighted a pair of Apple patent applications offering details on the company's implementation of its "Touch ID" fingerprint sensor in the iPhone 5s. The highly technical patent applications showed how the system works and revealed that Apple first moved to protect the ideas with the filing of several provisional patent applications in May 2012. A third Touch ID-related patent application filed by Apple also quietly surfaced last week (via Unwired View) but has flown under the radar until now because it appears to have published on the World Intellectual Property Organization's database but not the U.S. Pate