Patents by Inventor Yang Ning Pi

Yang Ning Pi 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).

  • Digital compass
    Patent number: 5875561
    Abstract: A digital compass has a digital screen that shows the distance between compass legs, one half the angle between the compass legs, and a ratio between half of an inductive rod raising value to a length of the compass leg from a compass leg mounting point to a carrier arm mounting point. The information on the digital screen is sufficient for operation of the compass, such as dividing a circle into equal arcs.
    Type: Grant
    Filed: February 24, 1997
    Date of Patent: March 2, 1999
    Inventors: Chi Chung Chen, Yang Ning Pi