Patents by Inventor Joseph P. W. Henderson

Joseph P. W. Henderson 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).

  • Method of sorting mail using a coded postage stamp
    Patent number: 3995741
    Abstract: Postage stamps selected in accordance with destination, are cancelled on mail by activating radiation which also establishes a destination code that is machine readable. The destination code is formed by a pattern of color zones on the cancelled postage stamp, the color of said zones being changed by the activating radiation.
    Type: Grant
    Filed: June 17, 1975
    Date of Patent: December 7, 1976
    Inventor: Joseph P. W. Henderson