Patents by Inventor Marvin Engstrom

Marvin Engstrom 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).

  • Automated continuous hydraulic variable setting track
    Patent number: 6001036
    Abstract: A variable setting track system is provided including a track frame. A wheel assembly includes a wheel slidable with respect to the frame. A track is situated about the wheel and the track frame. Also included is a hydraulic mechanism coupled to the wheel for urging the same against the track.
    Type: Grant
    Filed: April 16, 1998
    Date of Patent: December 14, 1999
    Inventors: Jim O'Brien, Marvin Engstrom