Patents Assigned to Hall-Thermotank Products Ltd.
  • Refrigerant screw compression with liquid refrigerant injection
    Patent number: 3931718
    Abstract: A screw compressor, compressing refrigerant gas in a refrigeration system, which has liquid refrigerant passed back through it, in counter flow to the gas being compressed, for sealing the rotor clearances. The liquefied gas from the condenser of the system returns to the evaporator either wholly by way of the compressor or partly by way of the compressor as aforesaid and partly through a bypass equipped with an expansion valve.
    Type: Grant
    Filed: July 17, 1973
    Date of Patent: January 13, 1976
    Assignee: Hall-Thermotank Products Ltd.
    Inventor: Geoffrey Gordon Haselden