US Patent Issued to Shanghai Ming Wei Hardware on Nov. 25 for "Delayed unlocking push-down type emergency door-locking device" (Chinese Inventor)

ALEXANDRIA, Va., Nov. 25 -- United States Patent no. 12,480,336, issued on Nov. 25, was assigned to Shanghai Ming Wei Hardware Co. Ltd. (Shanghai).

"Delayed unlocking push-down type emergency door-locking device" was invented by Jung-Chung Chen (Shanghai).

According to the abstract* released by the U.S. Patent & Trademark Office: "A delayed unlocking push-down type emergency door-locking device includes a main lock seat, a secondary lock seat, a push-down type handle assembly, a position-sensing module and a timing electromagnetic traction assembly. The push-down type handle assembly is configured for moving along a driving path from a locking position toward an unlocking position, thereby at least one of locking element of the main lock ...