Patents by Inventor Derek Gilbert Barnstable

Derek Gilbert Barnstable 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).

  • Soil working apparatus
    Patent number: 6578502
    Abstract: A soil working apparatus including at least one rotatable soil working members (52, 54) for disturbing the soil in the direction of travel of the apparatus, the rotatable soil working members (52, 54) being obliquely passing through and beneath the surface of the soil, and at least one press wheel (80, 82) positioned beside and at least partially behind each of the at least one rotatable soil working members for pressing down the soil disturbed by the rotatable soil working members, each press wheel corresponding to at least one rotatable soil working members.
    Type: Grant
    Filed: May 21, 2001
    Date of Patent: June 17, 2003
    Inventors: Derek Gilbert Barnstable, Denis James Danaher