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US4954289A
Expired / Lapsed
US
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Azeotropes of hydrogen-containing halocarbons with butanes
Assignee: EIDP Inc
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Filing: 1989-06-12
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Granted: 1990-09-04
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Expires: 2009-06-12
Abstract
Abstract Azeotropes of 1-chloro-1,2,2,2-tetrafluoroethane or 1-chloro-1,1-difluoroethane with n-butane or isobutane and their use as propellants and foam blowing agents.
Inventors
- 👤 Philip L. Bartlett
- 👤 Joseph A. Creazzo
- 👤 Robert A. Gorski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:58
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/149; C09; C09K; C09K3/00; C09K3/30; C08J2207/00; C08J2207/04; Y; Y10; Y10S; Y10S521/00; Y10S521/91
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
66 words
An azeotropic composition consisting essentially of a member of the group consisting of 84.6 to 88.2 weight percent 1-chloro-1,2,2,2tetrafluoroethane and 11.8 to 15.4 weight percent n-butane; 68.5 to 76.5 weight percent 1-chloro-1,2,2,2-tetrafluoroethane and 23.5 to 31.5 weight percent isobutane; 74.6 to 83.2 weight percent 1-chloro-1,1-difluoroethane and 16.8 to 25.4 weight percent n-butane; and 58.6 to 62.4 weight percent 1-chloro-1,1-difluoroethane and 37.6 to 41.4 weight percent isobutane.
Claim 2
Dependent Claim
66 words
An azeotropic composition consisting essentially of a member of the group consisting of 84.6 to 88.2 weight percent 1-chloro-1,2,2,2tetrafluoroethane and 11.8 to 15.4 weight percent n-butane; 68.5 to 76.5 weight percent 1-chloro-1,2,2,2-tetrafluoroethane and 23.5 to 31.5 weight percent isobutane; 74.6 to 83.2 weight percent 1-chloro-1,1-difluoroethane and 16.8 to 25.4 weight percent n-butane; and 58.6 to 62.4 weight percent 1-chloro-1,1-difluoroethane and 37.6 to 41.4 weight percent isobutane.
Claim 3
Dependent Claim
29 words
A process for preparing aerosol formulations wherein the active ingredients are combined in an aerosol container with an azeotropic composition of claim 1, said azeotropic composition functioning as propellant.
Claim 4
Dependent Claim
23 words
An azeotropic composition of claim 1 consisting essentially of from 84.6 to 88.2 weight percent 1-chloro-1,2,2,2-tetrafluoroethane and 11.8 to 15.4 weight percent n-butane.
Claim 5
Dependent Claim
23 words
An azeotropic composition of claim 1 consisting essentially of from 68.5 to 76.5 weight percent 1-chloro-1,2,2,2-tetrafluoroethane and 23.5 to 31.5 weight percent isobutane.
Claim 6
Dependent Claim
23 words
An azeotropic composition of claim 1 consisting essentially of from 74.6 to 83.2 weight percent 1-chloro-1,1-difluoroethane and 16.8 to 25.4 weight percent n-butane.
Claim 7
Dependent Claim
23 words
An azeotropic composition of claim 1 consisting essentially of from 58.6 to 62.4 weight percent 1-chloro-1,1-difluoroethane and 37.6 to 41.4 weight percent isobutane.
Claim 8
Dependent Claim
20 words
An azeotropic composition of claim 1 consisting essentially of about 86.4 weight percent 1-chloro-1,2,2,2-tetrafluoroethane and about 13.6 weight percent n-butane.
Claim 9
Dependent Claim
20 words
An azeotropic composition of claim 1 consisting essentially of about 72.5 weight percent 1-chloro-1,2,2,2-tetrafluoroethane and about 27.5 weight percent isobutane.
Claim 10
Dependent Claim
20 words
An azeotropic composition of claim 1 consisting essentially of about 78.9 weight percent 1-chloro-1,1-difluoroethane and about 21.1 weight percent n-butane.
Claim 11
Dependent Claim
20 words
An azeotropic composition of claim 1 consisting essentially of about 60.5 weight percent 1-chloro-1,1-difluoroethane and about 39.5 weight percent isobutane.
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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) | 1993-09-03 | 1994-03-05 | 1994-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-03 | 1998-03-05 | 1998-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-03 | 2002-03-05 | 2002-09-04 | $7700.00 | Window Closed / Lapsed |