Patents by Inventor Chien-Hsia Liao

Chien-Hsia Liao 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).

  • Screwdriver provided with percussion mechanism to facilitate the unfastening and the fastening of screw
    Patent number: 6860180
    Abstract: A screwdriver comprises a handle and a shank. The handle is provided at a head end with a percussion block. The shank is put through the interior of the handle such that one end of the shank is fastened with the percussion block, and that other end of the shank is extended out of other end of the handle. The shank is provided on the other end thereof with a percussion-rotation mechanism which is in turn fastened with a tip. The mechanism enables the tip to turn instantaneously at the time when the percussion block is impacted.
    Type: Grant
    Filed: October 31, 2003
    Date of Patent: March 1, 2005
    Inventors: Chien-Hsia Liao, Pei-Shan Li