ALEXANDRIA, Va., June 9 -- United States Patent no. 12,286,816, issued on April 29, was assigned to THASE ENTERPRISE Co. LTD. (New Taipei, Taiwan).

"Press type door lock device used in fireproof doors" was invented by Ching-Tien Lin (New Taipei, Taiwan).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present disclosure provides a fire door lock mechanism. A handlebar is coupled to one end of an actuator whose the other end is connected with a push rod. A lock bolt is rotatably mounted in a lock cover mount which accommodates a glide mount used to drive the push rod to move horizontally. When the actuator receives a depression force from the handlebar, the actuator is driven to rotate and induces the push r...