ALEXANDRIA, Va., May 26 -- United States Patent no. 12,637,323, issued on May 26, was assigned to Otis Elevator Co. (Farmington, Conn.).

"Position detecting device and elevator system including the same" was invented by DaYong Han (Shanghai), ManMan Liu (Shanghai) and Wei Wang (Shanghai).

According to the abstract* released by the U.S. Patent & Trademark Office: "A position detecting device and an elevator system including the same. The position detecting device includes a ruler guide formed with a through groove for receiving and guiding a position ruler of the elevator system, the through groove further has a through opening toward a side surface of the ruler guide; and a limitator is provided at the through opening, the limitator is di...