Patents by Inventor Willard C. Hamm

Willard C. Hamm 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).

  • Tinted metallized recording medium
    Patent number: 4319255
    Abstract: Method of coloring the erodible metal surface of a metallized record medium by overprinting discrete limited areas of the surface with one or more inks of preselected colors to provide a distinctive halftone tint to the surface without adversely affecting the recording quality of the medium during subsequent selective removal of the metal coating.
    Type: Grant
    Filed: December 14, 1979
    Date of Patent: March 9, 1982
    Assignee: International Business Machines Corporation
    Inventors: John A. Franczyk, Willard C. Hamm, Russell T. White, Jr.