ALEXANDRIA, Va., June 25 -- United States Patent no. 12,338,832, issued on June 24.
"Ceiling fan" was invented by Kuo-Tsun Lin (Taichung, Taiwan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A ceiling fan includes a carrier unit, a motor, a fan body, a light sensing unit, and a control unit. The light sensing unit emits a light signal, receives the light signal, and outputs a sensing signal related to a round trip time of the light signal. The control unit performs a safety procedure of: calculating a distance and a moving speed of an object relative to the ceiling fan based on the sensing signal; controlling the motor to rotate the fan body at a predetermined rotational speed when the moving speed is great...