Patents by Inventor Clarence D. Marshall

Clarence D. Marshall 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).

  • Flexible magnet attractant display mat
    Patent number: 5503891
    Abstract: The present invention relates to a display mat for receiving magnetic display symbols, wherein said display mat is flexible and magnet attractant.
    Type: Grant
    Filed: October 25, 1994
    Date of Patent: April 2, 1996
    Assignee: Marflex International Inc.
    Inventors: Clarence D. Marshall, Robert A. Marshall