ALEXANDRIA, Va., June 4 -- United States Patent no. 12,321,431, issued on June 3, was assigned to Google LLC (Mountain View, Calif.).

"Face authentication anti-spoofing using ultrasound" was invented by Octavio Ponce Madrigal (Mountain View, Calif.), Anton Heistser (Munich) and Patrick M. Amihood (Palo Alto, Calif.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Techniques and apparatuses are described that implement face authentication anti-spoofing using ultrasound. In particular, a face-authentication system uses ultrasound to distinguish between a real human face and a presentation attack that uses instruments to present a version of a human face. The face-authentication system includes or communicates wi...