ALEXANDRIA, Va., July 15 -- United States Patent no. 12,663,642, issued on June 23, was assigned to Valve Corp. (Bellevue, Wash.).

"Position tracking systems and methods for head-mounted display systems with LED droop compensation" was invented by Evan Fletcher (Bellevue, Wash.), Jeffrey Walter Mucha (Bellevue, Wash.), Joshua Mark Hudman (Issaquah, Wash.), Alan Yates (Bellevue, Wash.), Gordon Wayne Stoll (Sammamish, Wash.), Jeffrey George Leinbaugh (Bellevue, Wash.) and Charles Lohr (Bellevue, Wash.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Systems and methods for tracking the position of one or more head-mounted display (HMD) system components of an HMD system. The HMD components may carry a plurality ...