Patents by Inventor Keith Michael Chapman

Keith Michael Chapman 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: 7543824
    Abstract: A hydraulic suspension unit for the front axle suspension of a tractor, comprises a hydraulic jack having a cylinder body, a piston arranged within the cylinder body to define two variable volume working chambers, a piston rod connected to the piston and sealingly guided in the cylinder body, and anchoring blocks on the ends of the cylinder body and of the piston rod for connecting the hydraulic jack to components of the suspension that are movable relative to one another. The suspension unit further comprising a valve body having valves connected to regulate the flow of hydraulic fluid to and from the working chambers of the jack. In the invention, the valve body is directly mounted on the anchoring block of the cylinder body on its side remote from the anchoring block of the piston rod.
    Type: Grant
    Filed: August 26, 2005
    Date of Patent: June 9, 2009
    Assignee: CNH America LLC
    Inventor: Keith Michael Chapman