Patents by Inventor Chih-Min Chang

Chih-Min 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).

  • Patent number: 6382051
    Abstract: A ratchet wrench includes a ratchet wheel rotatably mounted in a receiving portion at one end of a wrench body, a stop block mounted in an open chamber inside the wrench body and adapted to engage the ratchet wheel and to limit the direction of rotation of the ratchet wheel, and a spring mounted in the open chamber of the wrench body to support the stop block and to force the stop block into engagement with the ratchet wheel, the spring member having a midsection stopped between one sidewall of the open chamber of the wrench body and a peripheral wall of the stop block, two coupling portions respectively extended outwardly from the midsection of the spring member and respectively positioned in a blind hole in one sidewall of the open chamber of the wrench body and a blind hole in one sidewall of the stop block.
    Type: Grant
    Filed: September 5, 2001
    Date of Patent: May 7, 2002
    Inventor: Chih-Min Chang
  • Patent number: 6334255
    Abstract: A pair of shears comprises two pivotally-fastened handles, two blades pivoted to the handles, and a connection device pivoted with the two blades. The two handles are provided with a cutting edge. As the two handles are moved toward each other, the cutting edges and the blades are capable of bringing about independently a scissors action to execute the cutting of an object held therebetween.
    Type: Grant
    Filed: April 26, 2000
    Date of Patent: January 1, 2002
    Inventor: Chih-Min Chang