Patents by Inventor Jeffrey Ketchman

Jeffrey Ketchman 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).

  • Exercise bicycles
    Patent number: 4257588
    Abstract: A dual-crank type upper body and arm exerciser attachment readily attachable to existing exerciser bicycles, and in which the drag brake for the arm exerciser comprises an incompressible sleeve of rubber or elastomeric material pressed against the crank arm shaft.
    Type: Grant
    Filed: June 28, 1979
    Date of Patent: March 24, 1981
    Assignee: AMF Incorporated
    Inventor: Jeffrey Ketchman