Patents by Inventor Anthony G. Hammond

Anthony G. Hammond 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).

  • Hydraulic valves
    Patent number: 4413648
    Abstract: A pilot actuated hydraulic control valve has a flow setting member in the form of a valve piston an end of which co-operates with radial outlet ports of the valve to form a variable metering orifice. A flow sensor provides a feedback differential pressure proportional to the flow through the valve and that feedback differential is used to control a pilot stage which actuates the flow setting member.
    Type: Grant
    Filed: July 24, 1980
    Date of Patent: November 8, 1983
    Assignee: Sperry Limited
    Inventors: Ronald B. Walters, Anthony G. Hammond