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US5725791A
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Azeotropic and azeotrope-like compositions of 1,1,2,2-tetrafluoroethane
Assignee: EIDP Inc
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Filing: 1993-08-09
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Granted: 1998-03-10
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Expires: 2013-08-09
Abstract
Abstract The azeotropic compositions of 1,1,2,2-tetrafluoroethane and 1,1-difluoroethane and the azeotropic and azeotropic-like composition of 1,1,2,2-tetrafluoroethane and one of, 1-chloro-1,1-difluoroethane, perfluorocyclobutane, n-butane, isobutane and 1,1,1,2,3,3,3-heptafluoropropane, and their use as refrigerants, aerosol propellants and blowing agents for polymer foams, are disclosed. The azeotropic and azeotrope-like compositions of 1,1,1,2-tetrafluoroethane and one of perfluorocyclobutane and 1,1,1,2,3,3,3-heptafluoropropane are also useful as fire extinguishants.
Inventors
- 👤 Donald Bernard Bivens
- 👤 Brooks Shawn Lunger
- 👤 Akimichi Yokozeki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:33
CPC Classifications
A; A62; A62D; A62D1/00; A62D1/0028; A62D1/0057; C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/143; C08J9/144; C08J9/146; C08J9/149; C09; C09K; C09K3/00; C09K3/30; C09K5/00; C09K5/02; C09K5/04; C09K5/041; C09K5/044; C09K5/045; C08J2207/00; C08J2207/04; C09K2205/00; C09K2205/10; C09K2205/11; C09K2205/12; C09K2205/122; C09K2205/124; C09K2205/22; C09K2205/32
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
33 words
An azeotropic composition consisting essentially of about 80-99 weight percent 1,1,2,2-tetrafluoroethane and about 1-20 weight percent 1,1-difluoroethane, wherein the dew point and the bubble point are both about -19.6° C. at 14.7 psia.
Claim 2
Dependent Claim
33 words
An azeotropic composition consisting essentially of about 80-99 weight percent 1,1,2,2-tetrafluoroethane and about 1-20 weight percent 1,1-difluoroethane, wherein the dew point and the bubble point are both about -19.6° C. at 14.7 psia.
Claim 3
Dependent Claim
53 words
An azeotropic composition consisting essentially of about 92 weight percent 1,1,2,2-tetrafluoroethane and about 8 weight percent 1,1-difluoroethane wherein the dew point and the bubble point are both about -19.6° C. at 14.7 psia, said composition having a boiling temperature of about 10 degrees C. when the pressure is adjusted to about 46 psia.
Claim 4
Dependent Claim
53 words
An azeotropic composition consisting essentially of about 92 weight percent 1,1,2,2-tetrafluoroethane and about 8 weight percent 1,1-difluoroethane wherein the dew point and the bubble point are both about -19.6° C. at 14.7 psia, said composition having a boiling temperature of about 10 degrees C. when the pressure is adjusted to about 46 psia.
Claim 5
Dependent Claim
28 words
A process of producing refrigeration which comprises condensing the azeotropic composition of claim 1 and thereafter evaporating said composition in the vicinity of a body to be cooled.
Claim 6
Dependent Claim
13 words
An aerosol propellant composition consisting essentially of the azeotropic composition of claim 1.
Claim 7
Dependent Claim
21 words
The aerosol propellant composition of claim 4 consisting essentially of about 97.4 weight percent 1,1,2,2-tetrafluoroethane and about 2.6 weight percent difluoroethane.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-03-09 | 2001-09-08 | 2002-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-03-09 | 2005-09-08 | 2006-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-03-09 | 2009-09-08 | 2010-03-10 | $7700.00 | Window Closed / Lapsed |