ALEXANDRIA, Va., March 24 -- United States Patent no. 12,584,584, issued on March 24.
"Vacuum system component mechanism" was invented by Shih-Chen Chang (Taipei City, Taiwan) and Chih-Chun Ko (Taipei City, Taiwan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A door lock structure is disclosed. The door lock structure is used to mount a fire door and includes a base, a pressing component, a pressing shell and a locking component. The base is disposed on the fire door and has an accommodation groove, and a groove bottom of the accommodation groove has a first locking hole. The pressing component includes a pressing base, a roller column, a fixing plate, an elastic part and a locking part."
The patent was fi...