Patents by Inventor Stephen Franklin Bergen

Stephen Franklin Bergen 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).

  • Color discrimination test apparatus and method
    Patent number: 3956827
    Abstract: A color matching system, defined by "hue", "value" and "chroma" characteristics, is employed in a teaching program to develop an understanding of shade guide techniques for use by the dental profession.
    Type: Grant
    Filed: December 12, 1974
    Date of Patent: May 18, 1976
    Inventor: Stephen Franklin Bergen