US4954289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azeotropes of hydrogen-containing halocarbons with butanes
Assignee: EIDP Inc
•
Filing: 1989-06-12
•
Granted: 1990-09-04
•
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 02:18
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.
References Cited (Backward Citations)
US2999815A
Cited
US2999816A
Cited
US2999817A
Cited
US3881949A
Cited
US3903009A
Cited
US4157310A
Cited
US4055521A
Cited
US4144187A
Cited
US4155865A
Cited
US4767561A
Cited
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 |