Patents by Inventor John K. Hedberg

John K. Hedberg 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).

  • Adjustable tennis racket handle
    Patent number: 3931968
    Abstract: A tennis racket handle is slidably adjustable along a shank and a ball movable with the handle is engageable in any of a plurality of longitudinally spaced depressions on the shank. In one form the ball is urged away from the depressions by a spring and can be held in a selected depression only by a firm grip on the handle. In another form a spring and cam normally holds the ball in a selected depression and is released by pressing a button extending to the exterior of the handle.
    Type: Grant
    Filed: May 13, 1974
    Date of Patent: January 13, 1976
    Inventor: John K. Hedberg