Patents by Inventor David M. Riherd

David M. Riherd 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).

  • Thermal printhead with ribbon exit guide
    Patent number: 4641148
    Abstract: A wear-resistant ribbon guide surface (11 or 25a, 25b) is added to a thermal printhead (1) to lower the ribbon exit angle after printing or to shift the ribbon exit position away from the printing. The angle past that surface remains large enough for visibility of prior printing. The modification of exit conditions makes the printing darker and significantly improves printhead life.
    Type: Grant
    Filed: October 31, 1985
    Date of Patent: February 3, 1987
    Assignee: International Business Machines Corporation
    Inventors: Stanley Dyer, James J. Molloy, Thoi Nguyen, David M. Riherd, William F. Voit, Jr., Donald L. West