ALEXANDRIA, Va., July 14 -- United States Patent no. 12,681,605, issued on July 14, was assigned to Anhui Easpeed Technology Co. Ltd. (Hefei, China).

"Location sensing method, location sensing device, and input terminal apparatus" was invented by Hong Liu (Hefei, China), Chao Fan (Hefei, China) and Dong-Cheng Han (Hefei, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A location sensing method, a location sensing device, and an input terminal apparatus are provided. The method comprises: in an initial stage, using the light intensity of a reflected light received by a receiver as an environment threshold; in a sensing stage, controlling a transmitter to sequentially emit sensing light, and converting th...