US 7,320,763 B2
Refrigerant for low temperature applications
Kenneth M Ponder, Cumming, Ga. (US); and Steffen Thomas, Buckhead, Ga. (US)
Assigned to Stefko Properties, LLC, Alpharetta, Ga. (US)
Filed on Dec. 28, 2005, as Appl. No. 11/320,492.
Claims priority of provisional application 60/639677, filed on Dec. 28, 2004.
Prior Publication US 2006/0191665 A1, Aug. 31, 2006
Int. Cl. C09K 5/04 (2006.01)
U.S. Cl. 252—68 14 Claims
OG exemplary drawing
 
1. A refrigerant composition comprising a combination of refrigerant gases and non-refrigerant gas components,
(a) the refrigerant gases consisting of:
about 84% to about 86% by weight pentafluoroethane; and
about 14% to about 16% by weight tetrafluoroethane; and
(b) the non-refrigerant gas components including about 0.5% to about 20% by weight of the refrigerant gases of a lubricating oil that includes polyol ester, or a synthetic alkyl aromatic compound, or a mixture of polyol ester and a synthetic alkyl aromatic compound, as its primary component.