Patents by Inventor David G. Clay

David G. Clay 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).

  • Multiplexed hydraulic control system with multiplexing valve having planar port array
    Patent number: 5088383
    Abstract: A multiplexed hydraulic control system which avoids the use of a rotary multiplexer and thereby allows for random selection of the multiplexed outlet ports and variable dwell times for the respective ports. A single hydraulic input is multiplexed among a plurality of hydraulic outputs. A control system provides two types of signals: (1) modulation signals selected from a plurality of multiplexed input signals for producing a modulating hydraulic flow, and (2) selector signals for operating on the multiplexer means to route the modulated signal to the appropriately selected channel.
    Type: Grant
    Filed: January 22, 1990
    Date of Patent: February 18, 1992
    Assignee: Woodward Governor Company
    Inventors: John W. Wardle, Plato J. Leeson, David G. Clay, Dale W. Sievert