Patents by Inventor Otis M. Francis

Otis M. Francis 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).

  • Foot pedal apparatus to provide variable output for guitar
    Publication number: 20080173164
    Abstract: A circuit for an electric guitar utilizes a transformer and balanced amplifier to facilitate the production of a variety of sound adjustment circuits.
    Type: Application
    Filed: January 18, 2007
    Publication date: July 24, 2008
    Inventors: Otis M. Francis, Bradley D. Tluczek