Patents by Inventor Chung C. Lai

Chung C. Lai 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 structure with a warning device
    Patent number: 5177466
    Abstract: A lock structure with a warning device, in which an additional set of tumblers are installed on the four sides of the cylinder body, the plug member and the sliding sleeves; in case of a wrong key being inserted into the cylinder body, the tumblers will be touched and projected outwards to trigger off a warning device.
    Type: Grant
    Filed: August 5, 1991
    Date of Patent: January 5, 1993
    Inventor: Chung C. Lai