ALEXANDRIA, Va., April 21 -- United States Patent no. 12,609,015, issued on April 21, was assigned to PIXART IMAGING INC. (Hsin-Chu County, Taiwan).

"Smoke detector capable of distinguishing smoke and particles" was invented by Cheng-Nan Tsai (Hsin-Chu County, Taiwan), Guo-Zhen Wang (Hsin-Chu County, Taiwan), Ching-Kun Chen (Hsin-Chu County, Taiwan), Yen-Chang Chu (Hsin-Chu County, Taiwan) and Chih-Ming Sun (Hsin-Chu County, Taiwan).

According to the abstract* released by the U.S. Patent & Trademark Office: "There is provided a smoke detector including a first light source, a second light source surface, a light sensor and a processor. The light sensor receives reflected light when the first light source and the second light source emit l...