Patents by Inventor Duane C. Haukaas

Duane C. Haukaas 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: 4690223
    Abstract: A rod weeder attachment for the tool bar of an agricultural implement comprises an arm portion extending rearwardly from a clamp on the tool bar defined by a pair of spaced parallel bars extending rearwardly to a transverse strut. From the strut to the ground is provided a rear arm portion the angle of which can be adjusted relative to the front arm portion. The rear arm portion carries on the lower end a ground wheel for running on the ground and providing drive therefrom. A pair of shanks at opposed ends of the strut extend down to the ground and carry at their lower ends a rod which is driven by a chain mechanism from the ground wheel. Springs allow the arm to lift relative to the tool bar.
    Type: Grant
    Filed: June 11, 1986
    Date of Patent: September 1, 1987
    Inventor: Duane C. Haukaas
  • Patent number: RE33255
    Abstract: A rod weeder attachment for the tool bar of an agricultural implement comprises an arm portion extending rearwardly from a clamp on the tool bar defined by a pair of spaced parallel bars extending rearwardly to a transvese strut. From the strut to the ground is provided a rear arm portion the angle of which can be adjusted relative to the front arm portion. The rear arm portion carries on the lower end a ground wheel for running on the ground and providing drive therefrom. A pair of shanks at opposed ends of the strut extend down to the ground and carry at their lower ends a rod which is driven by a chain mechanism from the ground wheel. Springs allow the arm to lift relative to the tool bar.
    Type: Grant
    Filed: January 30, 1989
    Date of Patent: July 10, 1990
    Inventor: Duane C. Haukaas