Patents by Inventor Kae M. Tzou

Kae M. Tzou 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).

  • Electronically self-latching cylinder lock
    Patent number: 4982587
    Abstract: An electronically self-latching cylinder lock comprising a cylinder into which a plug is inserted, a plurality of paired pin tumblers each of which is disposed in one of a plurality of bores formed inside the cylinder and the plug, and a plurality of switches which are controlled by the pin tumblers. The switches are used to actuate an electronic circuit to send out warnings with a buzzer and to secure the plug at its locked position with a latch which is driven with a solenoid, when an incorrect key is inserted into the key way.
    Type: Grant
    Filed: April 11, 1990
    Date of Patent: January 8, 1991
    Inventor: Kae M. Tzou
  • Electronically self-latching cylinder lock
    Patent number: 4953375
    Abstract: An electronically self-latching cylinder lock comprising a cylinder into which a plug is eccentrically inserted, a plurality pairs of pin tumblers each of which is disposed in one of a plurality of bores formed inside the cylinder and the plug, and a plurality of switches which are controlled by the pin tumblers. The switches are used to actuate an electronic circuit to send out warnings with a buzzer and to secure the plug at its locked position by a latch means, which is controlled by a solenoid, when an incorrect key is inserted into the key way.
    Type: Grant
    Filed: February 16, 1990
    Date of Patent: September 4, 1990
    Inventor: Kae M. Tzou