ALEXANDRIA, Va., Oct. 21 -- United States Patent no. 12,443,044, issued on Oct. 14, was assigned to Cellid Inc. (Tokyo).
"Projection substrate and smart glasses" was invented by Tatsuo Inabata (Tokyo), Susumu Tateoka (Tokyo), Toshiaki Shozu (Tokyo) and Satoshi Shiraga (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A projection substrate including: an incident region that includes a diffraction grating in which a plurality of first grooves are formed with a first period; a splitting region that includes a diffraction grating in which a plurality of second grooves are formed with a second period; and an emission region that includes a diffraction grating in which a plurality of third grooves are formed ...