ALEXANDRIA, Va., Aug. 26 -- United States Patent no. 12,401,317, issued on Aug. 26, was assigned to UNP ENERGY Co. LTD. (Taipei, Taiwan).
"Smudge detection system and its smudge detection device" was invented by Min-Hung Hsu (Taipei, Taiwan) and Hsin-Hsi Li (Taipei, Taiwan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A smudge detection device includes a container, a power supply battery, a smudge detection module, a photovoltaic device and a mainboard module. The container is formed with a recess at the top thereof, and a light transmissive cover covering the recess. The smudge detection module is located in the recess to detect the shading degree of the light transmissive cover that is covered. The photov...