Patents by Inventor Hugh G. Stirling

Hugh G. Stirling 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-inversion cultivator
    Patent number: 4687065
    Abstract: A cultivator comprises an array of laterally-spaced soil-inversion discs having their centers arranged in a substantially horizontal line lying at not more than 30.degree. to a transverse plane of the cultivator and being mounted for rotation about individual axes which are equally inclined to the vertical and, when viewed in plan, also to the longitudinal plane of the cultivator.
    Type: Grant
    Filed: December 17, 1984
    Date of Patent: August 18, 1987
    Assignee: National Research Development Corporation
    Inventors: Richard E. Cope, Hugh G. Stirling