Patents Assigned to Envirotech Systems
  • Refrigerant recovery and purification machine
    Patent number: 5327741
    Abstract: A refrigerant recovery machine which includes a distiller, oil separator, filters and an air separator to purify and reclaim refrigerant gas from a cooling system. The air separator may include a dual pressure gauge to regulate partial pressures of air and refrigerant to prevent the refrigerant from being vented to the atmosphere.
    Type: Grant
    Filed: January 14, 1992
    Date of Patent: July 12, 1994
    Assignee: Envirotech Systems
    Inventors: James L. Mason, Martin H. Pingel