Patents by Inventor Hsu-Hei Tsai

Hsu-Hei Tsai 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).

  • Patent number: 5713615
    Abstract: A doorknob cover that provides a means for improving the appearance and feel of a doorknob while retaining the rotation and function of the doorknob. The cover, made of soft cloth-like material, is shaped similar to a doorknob with a spherical head, narrower neck and wider base. Openings along the neck of the cover and the flexibility of the material allow the base and neck of the cover to stretch and fit over the doorknob. A string is laced through the neck of the doorknob cover, then tied tightly to secure the cover on the doorknob so that it cannot be removed by pulling. The underside of the cover is coated with a layer of rubber-like material that promotes friction against the surface of the doorknob to allow easy operation of the doorknob without the cover slipping. The coating will also prevent the transfer of static electricity from the metal of the doorknob to the hand. In addition, the soft cover will protect the hand from the coldness of metal doorknobs during cold weather.
    Type: Grant
    Filed: August 2, 1996
    Date of Patent: February 3, 1998
    Inventor: Hsu-Hei Tsai