Patents by Inventor Chung Yun-Sheng

Chung Yun-Sheng 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).

  • Card-operated lock
    Patent number: 5146770
    Abstract: A card-operated lock using a card with embossed letters matching with corresponding letters on letter profiles in the lock for lowering of side levers on the letter profiles and consequently disengaging the letter profiles from their retaining plates to open the lock. The lock is designed to prevent opening thereof without the designated card.
    Type: Grant
    Filed: September 27, 1991
    Date of Patent: September 15, 1992
    Inventor: Chung Yun-Sheng