ALEXANDRIA, Va., July 30 -- United States Patent no. 12,375,844, issued on July 29, was assigned to Microsoft Technology Licensing LLC (Redmond, Wash.).

"Earbud for authenticated sessions in computing devices" was invented by Eran Arbel (Netanya, Israel), Gilad Pundak (Rehovot, Israel) and Liran Lipa Lyabock (Tel Aviv, Israel).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method of using an earbud to maintain a user's authenticated session comprises, after establishing a user's first authenticated session in a first computing device, broadcasting an initial ultrasonic signal from a speaker of the earbud. At least a subsequent ultrasonic echo signal that is received at an in-ear microphone of the earbud is ...