US Patent Issued to Otis Elevator on March 24 for "Device for inputting elevator call commands and elevator control system" (Chinese Inventors)

ALEXANDRIA, Va., March 24 -- United States Patent no. 12,587,185, issued on March 24, was assigned to Otis Elevator Co. (Farmington, Conn.).

"Device for inputting elevator call commands and elevator control system" was invented by Heping Qiu (Shanghai) and Qiyun Sun (Shanghai).

According to the abstract* released by the U.S. Patent & Trademark Office: "A device for inputting an elevator calling command an elevator control system including the device. A device for inputting an elevator calling includes one or more button units, each of the button units including a switching element and a variable resistance circuit coupled with the switching element. The variable resistance circuit includes a button switch and a display element coupled in ...