Patents by Inventor Stephen H. Schaefer

Stephen H. Schaefer 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).

  • Utility vehicle
    Patent number: 4955451
    Abstract: A three-wheel utility vehicle employing a power head with a hydraulic motor and having power wheel suspension. A trailer is connected to the power head and has a large capacity and low bed and is pivotably coupled to the one-wheeled power head. A gasoline engine drives a two-stage, variable displacement pump which is controlled by a directional valve, to drive a reversible hydraulic motor coupled to the front drive wheel. The power head includes a hydraulic braking system.
    Type: Grant
    Filed: October 17, 1988
    Date of Patent: September 11, 1990
    Inventor: Stephen H. Schaefer