Halocarbon blends for refrigerant use

Claim 1

A refrigerant comprising about 10 to 60 weight percent of a first halocarbon having a boiling point at atmospheric pressure in the range of about -50° C. to about -30° C., about 10 to 60 weight percent of a second halocarbon having a boiling point at atmospheric pressure in the range of about -30° C. to about -5° C., and about 10 to 75 weight percent of a third halocarbon having a boiling point at atmospheric pressure in the range of about -15° C. to about 30° C.; said second halocarbon being higher boiling than said first halocarbon and said third halocarbon being higher boiling than said second halocarbon; said halocarbons containing at least one fluorine atom; at least one of said halocarbons containing a hydrogen atom; said first and third halocarbons being nonflammable; said first, second and third halocarbons and their proportions being chosen such that the resulting refrigerant is nonflammable and has a vapor pressure substantially equal to the vapor pressure of dichlorodifluoromethane over the temperature range of about 0° C. to about 100° C.; said refrigerant having substantially lower ozone depletion potential than the ozone depletion potential of dichlorodifluoromethane, said refrigerant excluding dichlorodifluoromethane.