Patents by Inventor M. Duane Marrs

M. Duane Marrs 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).

  • Resonator guitar simulator
    Patent number: 4823668
    Abstract: A stringed musical instrument having a sound box including a resonator having a solid top wall and a resonator chamber opening through the bottom surface of the sound box, and a bridge bar in contact with both the top wall of the resonator and the strings of the instrument.
    Type: Grant
    Filed: January 28, 1988
    Date of Patent: April 25, 1989
    Inventor: M. Duane Marrs