ALEXANDRIA, Va., July 15 -- United States Patent no. 12,664,873, issued on June 23, was assigned to ROZETATECH Co. Ltd. (Seongnam-si, South Korea).
"Fire alarm device inspection method and fire alarm device" was invented by Youngjin Cho (Chungcheongbuk-do, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "A fire alarm apparatus according to an embodiment of the present invention may include a plurality of first detectors, each first detector detecting an occurrence of a fire and each first detector being activated at every first time, a plurality of second detectors, each second detector detecting the occurrence of the fire and each second detector being activated at every second time different from...