Patents by Inventor Graham F. Hurlstone

Graham F. Hurlstone 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 shelters
    Patent number: 4899486
    Abstract: A tree shelter 10 comprises a twin-walled tubular extrusion of UV-degradable polypropylene formed with an out-turned lip or flange 28 at its upper end and a longitudinal V-section channel receiving a stake 26 which is securable therein by two ratchet-locking cable ties 32.
    Type: Grant
    Filed: June 2, 1987
    Date of Patent: February 13, 1990
    Inventor: Graham F. Hurlstone
  • Tree trunk guard
    Patent number: D298998
    Type: Grant
    Filed: March 31, 1986
    Date of Patent: December 20, 1988
    Inventor: Graham F. Hurlstone