Patents by Inventor John D. Pritchard

John D. Pritchard 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).

  • Multiplexing valve
    Patent number: 5570718
    Abstract: A multiplexing valve is provided having a spool axially movable within a valve casing under the control fluid pressure introduced into variable volume chambers. The spool has passages formed therein such that, with appropriate positioning of the spool, fluid flow communication can be selectively established or inhibited between fluid sources and/or sinks and a given port.
    Type: Grant
    Filed: September 6, 1994
    Date of Patent: November 5, 1996
    Assignee: Lucas Industries public limited company
    Inventors: Trevor S. Smith, John D. Pritchard, John H. Buscher