Refrigerant composition comprising difluoromethane,...

Details Refrigerant composition comprising difluoromethane,... Refrigerant composition comprising difluoromethane,...

2005-01-11

2005-01-11

Hardee, John R. (Department: 1751)

Compositions

Vaporization, or expansion, refrigeration or heat or energy...

Reexamination Certificate

active

06841087

ABSTRACT:
A refrigerant composition that can be a substitute for chlorodifluoromethane (HCFC-22) comprises: (a) a first constituent of difluoromethane, (b) a second constituent of 1,1,1-trifluoroethane, (c) a third constituent of 1,1,1,2-tetrafluoroethane, and (d) a fourth constituent selected from the group consisting of 1,1-difluoroethane, 1,1,1,2,3,3,3-heptafluoropropane, 1,1,1,2,3,3-hexafluropropane and butane.

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