Patents by Inventor Lawrence J. Guertin

Lawrence J. Guertin 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).

  • Controlling refrigeration
    Patent number: 5867998
    Abstract: A controller operates an electronic expansion valve (EEV) to control flow of refrigerant in an evaporator coil of a refrigeration system. The controller measures a superheat of the coil over a natural fill and boil cycle of the coil to determine an average rate at which the flow of refrigerant into the coil produces a desired temperature difference across the coil. The controller then operates the valve in a manner to control the flow of refrigerant based on the average rate.
    Type: Grant
    Filed: February 10, 1997
    Date of Patent: February 9, 1999
    Assignee: EIL Instruments Inc.
    Inventor: Lawrence J. Guertin