Patents by Inventor Christopher Duderstadt

Christopher Duderstadt 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).

  • Lift truck having improved single mast and bearing wheel assembly
    Patent number: 4944368
    Abstract: A fork lift assembly is supported against a single rectangular mast by at least four separate bearing wheel assemblies. The rectangular mast is positioned relative to the fork lift assembly so that a front edge of the rectangular mast is positioned directly in line with the torque forces exerted by the load. Since the bending forces applied to the mast by the lifted load are in the direction of the edge of the mast, as opposed to the side of the mast, the mast can support a greater load. Further, the positioning of the four bearing wheel assemblies contacting each of the four sides of the masat inherently eliminate any side-to-side and twisting play in the fork lift assembly.
    Type: Grant
    Filed: May 25, 1989
    Date of Patent: July 31, 1990
    Inventor: J. Christopher Duderstadt
  • Child's rocker
    Patent number: D278484
    Type: Grant
    Filed: January 13, 1983
    Date of Patent: April 23, 1985
    Inventor: Christopher Duderstadt