Patents by Inventor Frederick L. Ager

Frederick L. Ager 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).

  • Closed loop refrigerant recovery system
    Patent number: 5131242
    Abstract: A closed loop refrigerant recovery system (10) having a primary purge condenser (20) and a secondary purge condenser (30 ). Non-condensible gas and refrigerant vapor is vented from condenser (8) to primary purge condenser (20). Non-condensible gas still containing refrigerant vapor is compressed by purge conpressor (50) and conducted to secondary purge condenser (30). The temperature of secondary purge condenser (30) is maintained low enough so that when relief valve (36) lifts, there will be no refrigerant vapor contained in the gas released.
    Type: Grant
    Filed: November 21, 1990
    Date of Patent: July 21, 1992
    Inventor: Frederick L. Ager