Patent number: 6800216
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 1,1,1,2,3,3,3-heptafluoropropane and (d) a fourth constituent selected from the group consisting of isobutane, 1,1,1,2,3,3-hexafluropropane and butane; or comprises: (a) a first constituent of difluoromethane, (b) a second constituent of 1,1,1,2-tetrafluoroethane, (c) a third constituent of 1,1,-difluoroethane, and (d) a fourth constituent selected from the group consisting of 1,1,1,2,3,3,3-heptafluoropropane, 1,1,1,2,3,3-hexafluropropane and butane.
Type:
Grant
Filed:
July 24, 2002
Date of Patent:
October 5, 2004
Assignee:
Korea Institute of Science and Technology
Inventors:
Byung-Gwon Lee, Jong-Sung Lim, Hoon Sik Kim, Chang-Nyeon Kim