Patents by Inventor Philip A. Stephenson

Philip A. Stephenson 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).

  • Refrigeration system with multi-function heat exchanger
    Patent number: 8590328
    Abstract: A refrigeration system with a multi-function heat exchanger has a first heat exchanger with an internal partition defining a condenser, a subcooler and an evaporator. An expansion device is located external of the heat exchanger and receives condensed refrigerant from the subcooler and provides expanded refrigerant to the evaporator. A compressor circulates the refrigerant through the condenser, the subcooler, and the evaporator. A secondary coolant circulates through the subcooler, the evaporator and the loads. A control system receives refrigerant temperature and pressure signals, and provides a control signal to the expansion device to maintain a temperature of the refrigerant within a predetermined range. A second heat exchanger cools a condensing fluid circulating through the condenser to condense the refrigerant.
    Type: Grant
    Filed: February 3, 2010
    Date of Patent: November 26, 2013
    Assignee: Hill Phoenix, Inc.
    Inventors: John D. Bittner, Philip A. Stephenson
  • REFRIGERATION SYSTEM WITH MULTI-FUNCTION HEAT EXCHANGER
    Publication number: 20110185757
    Abstract: A refrigeration system with a multi-function heat exchanger has a first heat exchanger with an internal partition defining a condenser, a subcooler and an evaporator. An expansion device is located external of the heat exchanger and receives condensed refrigerant from the subcooler and provides expanded refrigerant to the evaporator. A compressor circulates the refrigerant through the condenser, the subcooler, and the evaporator. A secondary coolant circulates through the subcooler, the evaporator and the loads. A control system receives refrigerant temperature and pressure signals, and provides a control signal to the expansion device to maintain a temperature of the refrigerant within a predetermined range. A second heat exchanger cools a condensing fluid circulating through the condenser to condense the refrigerant.
    Type: Application
    Filed: February 3, 2010
    Publication date: August 4, 2011
    Inventors: John D. Bittner, Philip A. Stephenson