Patents by Inventor Rudolph H. Wittke

Rudolph H. Wittke 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).

  • Four-wheel drive tractor
    Patent number: 5020627
    Abstract: A highly maneuverable four-wheel drive, four-wheel steer tractor is provided with hydraulic motors mounted at each wheel to drive the wheels. Each wheel and associated hydraulic motor is pivotable relative to the frame of the tractor. Steering is accomplished at all four wheels simultaneously by use of a hydraulic piston which rotates a longitudinal bar suspended under the frame. The elongated bar drives tie rods to the wheel and motor assemblies to cause steering deflection. The front wheels steer oppositely to the rear wheels to reduce the turning radius of the tractor.
    Type: Grant
    Filed: September 12, 1990
    Date of Patent: June 4, 1991
    Inventor: Rudolph H. Wittke
  • Multipurpose tractor having a front adjustable tool support
    Patent number: D245605
    Type: Grant
    Filed: May 4, 1976
    Date of Patent: August 30, 1977
    Inventor: Rudolph H. Wittke