Patents by Inventor Bao L. Chang

Bao L. 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).

  • Push-button ratchet wrench
    Patent number: D311314
    Type: Grant
    Filed: September 12, 1988
    Date of Patent: October 16, 1990
    Inventor: Bao L. Chang