Patents by Inventor William Dennis McMurtrie

William Dennis McMurtrie 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).

  • Electric switch gauge for screw compressors
    Patent number: 6139280
    Abstract: A control apparatus, for measuring pressure in relation to a rotary screw compressor with capacity control means and a prime mover, including a pressure sensor to monitor the prime mover manifold pressure, and a series of relays which when tripped by the pressure sensor will engage a pressure mechanism to engage the capacity control means on the compressor. The pressure mechanism may be a hydraulic or a pneumatic pressure mechanism and the apparatus may further include a second pressure sensor to monitor the inlet gas pressure to the compressor and a third pressure sensor to monitor discharge pressure of the gas compressor.
    Type: Grant
    Filed: January 21, 1998
    Date of Patent: October 31, 2000
    Assignee: Compressor Systems, Inc.
    Inventors: James A. Holt, William Dennis McMurtrie