Patents by Inventor Chi-Yeh Lin

Chi-Yeh Lin 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).

  • Ratchet screw driver
    Patent number: 5142953
    Abstract: A screw driver including a sleeve having a handle coupled to one end and having a number of teeth formed in the inner surface, a shaft rotatably received in the sleeve, a pawl rotatably engaged in the head, a rod rotatably received in the shaft, a spring and a ball received in the rod and the ball being biased to engage with the pawl, a knob engaged on the shaft, a post engaged through the knob and the shaft and the rod so that the rod can be rotated by the knob, and the pawl being caused to engage with the teeth of the sleeve when the rod is rotated in either direction.
    Type: Grant
    Filed: September 25, 1991
    Date of Patent: September 1, 1992
    Inventor: Chi-Yeh Lin
  • Ratchet wrench
    Patent number: D336225
    Type: Grant
    Filed: September 27, 1991
    Date of Patent: June 8, 1993
    Inventor: Chi-Yeh Lin