ALEXANDRIA, Va., July 28 -- United States Patent no. 12,693,538, issued on July 28, was assigned to Valve Corp. (Bellevue, Wash.).

"Folded optics for a head mounted display" was invented by Joshua Hudman (Bellevue, Wash.) and Doug VanderWel (Kent, Wash.).

According to the abstract* released by the U.S. Patent & Trademark Office: "An optics system includes a first lens, a second lens, a first waveplate, a partial reflector, and a second waveplate. The partial reflector is between the first lens and the second lens. The first waveplate is between the first lens and the partial reflector. The second waveplate is between the second lens and the partial reflector. Reflective polarizers are on curved surfaces of the first lens and the second le...