Patents by Inventor Chung C. Tung

Chung C. Tung 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).

  • General purpose calculator having factorial capability
    Patent number: 4047012
    Abstract: The battery powered hand-held calculator for performing the arithmetic, trigonometric and logarithmic functions disclosed herein includes a factorial function which conveniently calculates factorials of positive integers.
    Type: Grant
    Filed: April 8, 1975
    Date of Patent: September 6, 1977
    Assignee: Hewlett-Packard Company
    Inventors: Peter D. Dickinson, Thomas E. Osborne, France Rode, Allen J. Baum, David S. Cochran, Chung C. Tung