Patents by Inventor Harlan J. Trefz

Harlan J. Trefz 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 steering vehicle apparatus
    Patent number: 5048853
    Abstract: A four-wheel steering apparatus for a vehicle includes assemblies for steering the front and rear wheels of the vehicle, and an interconnecting member for connecting the front and rear steering assemblies together to move in relation to one another such that there is a dwell period between movement of the front and rear steering assemblies. The interconnecting member is operated by a driver of the vehicle and the dwell period extends between the time when the movement of the front-wheel steering assembly begins and the time when the movement of the rear-wheel steering assembly begins.
    Type: Grant
    Filed: December 20, 1990
    Date of Patent: September 17, 1991
    Assignee: Noma Outdoor Products, Inc.
    Inventors: Harlan J. Trefz, John N. Lesikar
  • Lawn mower body
    Patent number: D311008
    Type: Grant
    Filed: May 31, 1988
    Date of Patent: October 2, 1990
    Assignee: Noma Outdoor Products, Inc.
    Inventors: John R. Durfee, Harlan J. Trefz