ALEXANDRIA, Va., Aug. 20 -- United States Patent no. 12,393,029, issued on Aug. 19, was assigned to ADEIA GUIDES INC. (San Jose, Calif.).

"Buried diffractive gratings for optical elements of augmented reality and virtual reality head-mounted displays" was invented by Yuval Ofir (Kfar Ha-Oranim, Israel).

According to the abstract* released by the U.S. Patent & Trademark Office: "Head-mounted displays with waveguides comprising buried diffractive gratings and methods for fabricating said waveguides are described herein. In an embodiment, a head-mounted display comprises an optical element and an image source that provides an image beam to an optical element. The optical element comprises a first flat surface, a second flat surface, and a bu...