Patents by Inventor T. S. Chang

T. S. Chang 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).

  • Prey trap without using bait
    Patent number: 6484436
    Abstract: A prey trap comprises a body having two supporting frames; two gates arranged on the supporting frames of a body; an actuating plate; a hanging frame connected to another side of the actuating plate; and two ropes. Each gate is connected with one end of a rope, and another end of the rope is arranged to be across the supporting frame. Each bead at the end of the rope and the hanging frame are confined by one another, and thus are in a steady position. When the actuating plate is lifted upwards to a predetermined height; the gate is at an upper end of the supporting frame. When the actuating plate is pressed and is released from the confinement of the hanging frame, the gate then drops downs rapidly and freely and further the gate and the body forms a closing condition.
    Type: Grant
    Filed: November 20, 2001
    Date of Patent: November 26, 2002
    Inventor: T. S. Chang
  • Eyeglass frame front
    Patent number: D381352
    Type: Grant
    Filed: March 14, 1996
    Date of Patent: July 22, 1997
    Inventor: T. S. Chang
  • Eyeglass frame front
    Patent number: D391979
    Type: Grant
    Filed: July 9, 1997
    Date of Patent: March 10, 1998
    Inventor: T. S. Chang
  • Eyeglass frame front
    Patent number: D391980
    Type: Grant
    Filed: July 9, 1997
    Date of Patent: March 10, 1998
    Inventor: T. S. Chang
  • Eyeglasses
    Patent number: D391981
    Type: Grant
    Filed: March 27, 1997
    Date of Patent: March 10, 1998
    Inventor: T. S. Chang
  • Eyeglasses
    Patent number: D400228
    Type: Grant
    Filed: November 6, 1997
    Date of Patent: October 27, 1998
    Inventor: T. S. Chang