Patents by Inventor Gin-Shan Hung

Gin-Shan Hung 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).

  • Door driving mechanism
    Patent number: 5448952
    Abstract: A driving mechanism is disposed in the bottom of a door for driving the door and includes a reduction gearing and a motor fixed to the door, and a gear coupled to the reduction gearing and engaged with two shafts for rotatably supporting the wheels of the door so as to apply a downward force to the pinions in order to prevent the wheels moving upward away from the tracks. A retaining device is fixed to one of the tracks or fixed to the ground and has an opening for engaging with one of the pinions so as to maintain the door in place.
    Type: Grant
    Filed: March 17, 1994
    Date of Patent: September 12, 1995
    Inventor: Gin-Shan Hung