Patents by Inventor Robert Terstall

Robert Terstall 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).

  • Apparatus for modulation of the timbre of an electrical amplifier, in particular for guitars
    Patent number: 5020109
    Abstract: In an apparatus for modulation of the timbre of an electrical amplifier, in particular for guitars, a cylindric coil (2), which can be disposed downstream of an amplifier output, and a bar magnet (3) inside the cylindric coil (2), which can be deflected against restoring forces within a limited amplitude range out of its position of equilibrium, are provided for achieving a tonal effect corresponding to the direct connection of a loudspeaker.
    Type: Grant
    Filed: December 4, 1989
    Date of Patent: May 28, 1991
    Assignee: Firma Roland Meinl
    Inventor: Robert Terstall