Patents by Inventor Herman H. Nijhof

Herman H. Nijhof 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).

  • Patent number: 4342162
    Abstract: A device for planing a body of ground material comprising at least one tube rotatably mounted in a supporting construction capable of being moved in horizontal position and rotated parallel to itself over the surface of the body to be planed. At least one helical blade is wound about the tube and merges into a scoop at the discharge end as regards the direction of conveyance. The scoop has the same radial dimension as the helical blade, while an opening is provided in the wall portion of the tube partially surrounded by the scoop. The tube is hollow at least at the location of the scoop and the hollow part is connected to a conveyor for discharging therefrom the quantity of ground material removed from the top surface.
    Type: Grant
    Filed: January 11, 1980
    Date of Patent: August 3, 1982
    Assignee: B.V. Machinefabriek en Constructiewerkplaats Gebr. Klinkenberg
    Inventors: Cornelis Spaans, Herman H. Nijhof