Patents by Inventor David L. Simonson

David L. Simonson 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: 4979847
    Abstract: An apparatus for pulverizing and spreading the gravel ridge formed by plowing the shoulder portion of a gravel road onto the travelled portion thereof includes a frame for towing behind a vehicle, vertically adjustable rear wheels on the frame, and a pair of hydraulically driven, transversely extending, blade carrying drums. By towing the frame along a gravel road while rotating the drums, the paddle-like blades pulverize and spread the gravel ridge.
    Type: Grant
    Filed: June 23, 1989
    Date of Patent: December 25, 1990
    Inventor: David L. Simonson