The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 14, 1992
Filed:
Apr. 02, 1991
Applicant:
Inventors:
Didier Arnaud, Courbevoie, FR;
Jean C Tanguy, Sannios, FR;
Assignee:
Societe Atochem, Puteaux, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C11D / ; C08J / ; C09K / ; C09K / ;
U.S. Cl.
CPC ...
252172 ; 62114 ; 203 67 ; 252 67 ; 252162 ; 252305 ; 252364 ; 252D / ; 264 53 ; 264D / ; 521 98 ; 521131 ;
Abstract
The invention relates to an azeotrope with a minimum boiling point, capable of being employed as a refrigerating fluid replacing trifluorobromomethane (Halon 1301) in industrial refrigeration systems at very low temperature with single-stage compression. The azeotrope according to the invention is a mixture of 1,1,1-trifluoroethane (HFA 143a) and of propane (R290). At the normal boiling point (approximately -53.4.degree. C. at 1.013 bars), its 1,1,1-trifluoroethane content is approximately 70.6 mass % and that of propane 29.4 %. This azeotrope can also be employed as an aerosol propellant or as a blowing agent for plastic foams.