Patents by Inventor Christopher J. Trumbull

Christopher J. Trumbull 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).

  • Patent number: 4886243
    Abstract: A hydraulically elevatable ramp apparatus is set forth wherein a ramp formed of an upper and lower portion with a pivotal hinge joining the two portions secured to a hydraulic jack at a forwardmost position. The ramp at a first lowered position accepts vehicles of diminished ground clearance wherein the vehicle is thereafter elevated to a second position whereupon the lower hinged portion is automatically repositioned upon elevation of the upper portion. The jack is formed with a resilient pad to insure a non-slip arrangement upon elevating a vehicle to a second elevated position.
    Type: Grant
    Filed: October 26, 1988
    Date of Patent: December 12, 1989
    Inventor: Christopher J. Trumbull