Patents by Inventor Nan C. Shih

Nan C. Shih 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).

  • Lock latch
    Patent number: 5342101
    Abstract: A door latch has an actuating mechanism which retracts the latch tongue by a small amount of rotation of a doorknob. The actuating mechanism includes a wheel rotated by the knob which has a projecting tooth engaging a lever that pulls a plate connected to the latch arm. The lever arm is longer than the tooth.
    Type: Grant
    Filed: June 11, 1993
    Date of Patent: August 30, 1994
    Inventor: Nan C. Shih
  • Lock structure with direction-changeable device
    Patent number: 4988133
    Abstract: A direction changeable lock has a latch case, a latch bolt, and a positioning rod which can easily be turned around manually through 180 degrees, so that it does not have a direction limitation when it is to be fixed on a door. The latch bolt has a recess for an anti-burglary bolt therein.
    Type: Grant
    Filed: December 2, 1988
    Date of Patent: January 29, 1991
    Inventor: Nan C. Shih
  • Tubular door lock with a bell
    Patent number: 4852922
    Abstract: A sort of tubular door lock whose inside knob or outside knob can be forced to rotate by each other's rotation and force a rotating unit to turn pushing and overpassing a projection of a knocking spring to get the knocking points at its both ends to knock on a bell for ringing. In addition, when said inside knob is locked up, the outside knob has no supporting force for making the latch rotated but can give an idle turning only.
    Type: Grant
    Filed: July 15, 1987
    Date of Patent: August 1, 1989
    Inventor: Nan C. Shih
  • Tubular door lock with a bell
    Patent number: 4800833
    Abstract: A sort of tubular door lock whose inside knob or outside knob can be forced to rotate by each other's rotation and force a rotating unit to turn pushing and overpassing a projection of a knocking spring to get the knocking points at its both ends to knock on a bell for ringing. In addition, when said inside knob is locked up, the outside knob has no supporting force for making the latch rotated but can give an idle turning only.
    Type: Grant
    Filed: October 28, 1986
    Date of Patent: January 31, 1989
    Inventor: Nan C. Shih
  • Bell lock (II)
    Patent number: 4577584
    Abstract: An improved knob lock commonly used, which comprises a bell inside. The main part of which is a rotator which is turned by rotating either of the knobs and has two extending-out springs to which are attached a steel ball respectively at their ends. Hindrance rods, which are used to prevent the springs from passing freely, make the springs bend until they are forced past the hindrance rods to knock hard on the bell giving out a ringing sound at the same time.
    Type: Grant
    Filed: December 24, 1984
    Date of Patent: March 25, 1986
    Inventor: Nan C. Shih