Patents by Inventor Delmar E. Mullen

Delmar E. Mullen 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).

  • Method and apparatus for preventing improper string return
    Patent number: 4141271
    Abstract: This method and apparatus prevents improper string return by restraining an end portion of a string of a stringed instrument, such as a pedal steel guitar, free of longitudinal movement with changes in tension of the string from a predetermined level of string tension. The invention also involves applying tension force to the string operatively collinearly with a linear projection of an end portion of the string while maintaining an end portion of the string free of longitudinal movement with changes in string tension from a predetermined level of string tension.
    Type: Grant
    Filed: September 1, 1976
    Date of Patent: February 27, 1979
    Inventor: Delmar E. Mullen