Patents by Inventor J. Robert Frederick

J. Robert Frederick 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).

  • Patent number: 4528887
    Abstract: An improved tuning device for mounting upon stringed musical instruments such as the guitar, banjo, mandolin and the like. The improvement relates to providing a construction wherein the winding spindle or drum upon which the string is attached may be selectively and independently rotated on a one to one basis or on a high multiple to one basis. The one to one turning ratio is designed to be used to initially wind the string from a relaxed condition to a pre-tuned degree of tension associated with replacing worn or broken strings. The multiple tuning basis is, in typical fashion, employed to fine tune the string tension to produce the appropriate musical note.
    Type: Grant
    Filed: August 4, 1983
    Date of Patent: July 16, 1985
    Inventor: J. Robert Frederick