Patents by Inventor Harlan J. Kelly

Harlan J. Kelly 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 springs for trampolines and the like
    Patent number: 4162063
    Abstract: The typical helical springs used to support the bed within the frame of a trampoline or the like are modified to incorporate adjustable hooks threadedly anchored within the springs at one end so that their overall length, and thus the tension on the bed, can be varied and overstretching accommodated. Two principal versions are disclosed, the more preferred one including an additional inner spring biasing the adjustable hook to a retracted position.
    Type: Grant
    Filed: January 15, 1976
    Date of Patent: July 24, 1979
    Assignee: Nissen Corporation
    Inventors: George P. Nissen, Harlan J. Kelly