Patents by Inventor Jon Keizer

Jon Keizer 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).

  • Capo-tremolo-slide attachment for guitars
    Patent number: 4563934
    Abstract: A variably spring-tensioned capo-tremolo-slide is mounted on a guitar string bridging carriage having support wheels on opposite sides of the strings which engage and follow tracks recessed below the top face of the guitar body and being parallel to the strings and fretboard. During use, the attachment serves the purposes of three existing devices and produces effects which are uniquely its own.
    Type: Grant
    Filed: October 10, 1984
    Date of Patent: January 14, 1986
    Inventor: Jon Keizer