Patents by Inventor Gregroy P. Herroon

Gregroy P. Herroon 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).

  • Control system for heat pump/air-conditioning system for improved cyclic performance
    Patent number: 5303562
    Abstract: The microprocessor-based control system optimizes efficiency of the ON/OFF cycle by shutting the expansion valve fully closed at the beginning of each OFF cycle to maintain system pressure differential. At the beginning of each ON cycle the expansion valve is opened to an initial larger than average of three openings to allow the system to quickly reach steady state operating levels. Thereafter, the valve opening is reduced to an average of the last three steady state settings. After a predetermined time, control of the valve opening is passed to an adaptive control algorithm which adjusts the valve setting for optimized performance during steady state.
    Type: Grant
    Filed: January 25, 1993
    Date of Patent: April 19, 1994
    Assignee: Copeland Corporation
    Inventors: Vijay Bahel, Hank Millet, Mickey Hickey, Hung Pham, Gregroy P. Herroon