Patents by Inventor Clayton O. Stevens

Clayton O. Stevens 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).

  • Changeable message sign construction
    Patent number: 4040194
    Abstract: Face sheets preferably formed of thin sheet aluminium are spaced apart with at least one having a horizontally recessed message pocket preferably debossed therein. A magnet, preferably magnetic tape, is mounted at the interior face of the message pocket selectively removably retaining a message plate preferably of steel positioned in the message pocket by magnetic force. The space between the face sheets is preferably foam filled with the foam covering the magnet.
    Type: Grant
    Filed: July 28, 1976
    Date of Patent: August 9, 1977
    Inventors: Hugh V. Penton, Gerald P. Dunphy, Clayton O. Stevens