Patents by Inventor Tsun-Hsing Chen

Tsun-Hsing Chen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5475996
    Abstract: An electromagnetic door lock comprises generally a rectangular housing, a locking mechanism, a pair of electromagnetic components enclosed therein by a front cover and a rear cover. The front cover has a keypad and a transverse slot on an upper portion connected with an identification circuit therein. The electromagnetic component include an actuation assembly and a shift assembly, each having a movable rod opposed to each other. When a code is inputted via the keypad or the transverse slot, the identification circuit therein will transmit an electric current to the actuation assembly for and creating a magnetic field therein to disengageably force the movable rod of the shift assembly to move backward to unlock a door.
    Type: Grant
    Filed: August 29, 1994
    Date of Patent: December 19, 1995
    Inventor: Tsun-Hsing Chen
  • Patent number: D351982
    Type: Grant
    Filed: August 6, 1993
    Date of Patent: November 1, 1994
    Inventor: Tsun-Hsing Chen