Patents by Inventor John G Wallace

John G Wallace 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).

  • Method and apparatus for refrigeration system control having electronic evaporator pressure regulators
    Patent number: 7134294
    Abstract: A method and apparatus for refrigeration system control includes a control system operable to meet cooling demand and control suction pressure for a plurality of refrigeration circuits each including a variable valve and an expansion valve. The controller controls the variable valve independently of the expansion valves to meet cooling demand by determining a change in a measured parameter and controlling at least one of the variable valves based upon the change to an approximately fully open position.
    Type: Grant
    Filed: May 13, 2005
    Date of Patent: November 14, 2006
    Assignee: Computer Process Controls, Inc.
    Inventors: Abtar Singh, Jim Chabucos, Paul Wickberg, John G Wallace