Patents by Inventor James R. Harter

James R. Harter 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).

  • Flow monitoring device
    Patent number: 4480467
    Abstract: The flow monitoring device comprises a housing having a passageway therethrough for liquid flow through the housing. The passageway has an inlet opening and an outlet opening. A first thermistor is provided for sensing the temperature of the liquid in the passageway at a place near the inlet opening. A heating resistor is provided for heating the liquid at a place near the outlet opening and a second thermistor is provided for sensing the temperature of the liquid at the place near the outlet opening. A control circuit controls the input of heat energy to the heating resistor for heating the liquid just enough to maintain a predetermined temperature differential between the first and second thermistors.
    Type: Grant
    Filed: November 29, 1982
    Date of Patent: November 6, 1984
    Assignee: Hyperion, Inc.
    Inventors: James R. Harter, Gary M. Freeman