Patents by Inventor David Swaim

David Swaim 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: 6397890
    Abstract: A variable metering fluid control valve comprising a valve body having at least one work port and one exhaust port with the ports in fluid communication with a spool bore and an exhaust core, said exhaust core having an exhaust core land and a reciprocating valve spool in the spool bore to control communication of fluid between the work port and the exhaust core, with said valve spool having a land portion with a plurality of variable length metering notches, wherein the land portion of the valve spool remains in contact with the exhaust core land through the full stroke of the valve spool. The variable length metering notches may be varied in width, depth, and cross-section so that precise control of the fluid system is achieved.
    Type: Grant
    Filed: February 15, 1999
    Date of Patent: June 4, 2002
    Assignee: Case Corp.
    Inventors: Roger Mickelson, Matthew J. Hennemann, David Swaim