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US 5,294,359 AGranted
Refrigerant compositions
AssigneeAlliedSignal Inc.
InventorsRajiv R. Singh, David P. Wilson, Earl A. E. Lund, Ian R. Shankland
Life of this patent
Estimating the term…
Abstract
Compositions comprising difluoromethane, 1,1,1,2-tetrafluoroethane and a member selected from the group consisting of 1,1-difluoroethane, 1,1,1-trifluoroethane, propane and dimethyl ether having a vapor pressure from about 12.2 psia to about 18.4 psia at -40.degree. F., are useful as refrigerants.
Claims5
Compositions comprising from about 25 to about 60 mole percent difluoromethane, from about 40 to about 75 mole percent, 1,1,1,2-tetrafluoroethane and from about 1 to about 9 mole percent dimethyl ether, having a vapor pressure from about 12.2 psia to about 18.4 psia at -40.degree. F.
Dependencies are inferred from the claim text.