Patent ID: 9453154
Filing Date: 2016-09-27
CPC Classification: C09K,F25B

Claim Text:
1. A non-chlorofluorocarbon (CFC) refrigerant mixture for use in multistage auto cascade ultralow and cryogenic temperature refrigeration systems, containing only one hydrochlorofluoro carbon (HCFC) component, the refrigerant mixture comprising: (i) At least four refrigerants selected from the group consisting of: (ii) At least two refrigerants, present in the refrigerant mixture, selected from the group consisting of: and (iii) At least two refrigerants selected from the group consisting of: wherein R-134a and R-125 works at both first and second stages of the multistage auto cascade system, wherein the refrigerant mixture has an ozone depletion potential between 0.005 and 0.007 combined with global warming potential in the range of 3500 to 4300 by eliminating the use of CFCs and using only one HCFC component, wherein the refrigerant mixture operates a compressor of the multistage auto cascade system with an operating temperature below 28 degree Celsius thereby controlling high discharge temperatures and high initial discharge pressures, and wherein the 4 compounds from (i), the 2 compounds from (ii) and the 2 compounds from (iii) make up 100% of the refrigerants in the refrigerant mixture.