Patents by Inventor Jeffrey A. Sikkema

Jeffrey A. Sikkema 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).

  • Electrohydraulic pilot valve
    Patent number: 5242149
    Abstract: An electrohydraulic pilot valve that includes a valve spool movably mounted within a valve body for selectively coupling a valve inlet to a valve outlet. A solenoid is mounted on the valve body for applying a force to one end of the spool as a function of an electronic control signal. A pair of fluid restrictions are connected between the valve outlet and a fluid pressure sump effectively to form a pressure divider, from which fluid is fed back to the opposing end of the valve spool.
    Type: Grant
    Filed: August 21, 1992
    Date of Patent: September 7, 1993
    Assignee: Vickers Incorporated
    Inventor: Jeffrey A. Sikkema