Patents by Inventor Derek M. Willis

Derek M. Willis 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).

  • Tree climbing gaff
    Patent number: 6405832
    Abstract: A tree-climbing device adapted to be attached to a user's boot. The device is fashioned with two different sized gaffs which are angularly disposed relative to the shank. The size and position of the two gaffs enhance a climbers stability, especially on smaller tree limbs.
    Type: Grant
    Filed: May 22, 2001
    Date of Patent: June 18, 2002
    Inventor: Derek M. Willis