ALEXANDRIA, Va., June 4 -- United States Patent no. 12,320,642, issued on June 3, was assigned to Apple Inc. (Cupertino, Calif.).

"Wearable skin vibration or silent gesture detector" was invented by Mehmet Mutlu (Grover Beach, Calif.) and Ahmet Fatih Cihan (San Jose, Calif.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed herein are wearable devices, their configurations, and methods of operation that use self-mixing interferometry signals of a self-mixing interferometry sensor to recognize user inputs. The user inputs may include voiced commands or silent gesture commands. The devices may be wearable on the user's head, with the self-mixing interferometry sensor configured to direct a beam of light ...