Patents by Inventor Bill C. B. Jeng

Bill C. B. Jeng 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).

  • Students multi-function protractor
    Patent number: 5187873
    Abstract: A protractor including a base having a curved surface formed in an upper portion, a disc including a circular outer peripheral surface for slidable engagement with the curved surface of the base, the disc including an opening, a pair of flanges formed in parallel in the opening, and a slide including two end portions slidably engaged with the flanges of the disc so that the slide can be guided to slide along the flanges, whereby various geometric figures can be drawn by the protractor when the disc rotates relative to the base and when the slide slides along the flanges.
    Type: Grant
    Filed: January 29, 1992
    Date of Patent: February 23, 1993
    Inventors: Bill C. B. Jeng, Chiang-Ming Chen