US4157979A
Expired / Lapsed
US
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Azeotropic compositions
Assignee: Phillips Petroleum Co
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Filing: 1978-04-07
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Granted: 1979-06-12
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Expires: 1998-04-07
Abstract
Abstract Azeotropic compositions are formed with n-butane, 1,1,2,2,3,3,4,4,4-nonafluoro-n-butane and 1,1,1,2,3,3,4,4,4-nonafluoro-n-butane.
Inventors
- 👤 Harold C. Walters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:43
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/5068; C11D7/5072; C09; C09K; C09K5/00; C09K5/02; C09K5/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
39 words
A boiling admixture which at substantially atmospheric pressure is characterized as from about 30 to about 35 weight percent n-butane, from about 62 to about 66 weight percent 1,1,1,2,3,3,4,4,4-nonafluoro-n-butane and from about 1 to about 5 weight percent 1,1,2,2,3,3,4,4,4-nonafluoro-n-butane.
Claim 2
Dependent Claim
39 words
A boiling admixture which at substantially atmospheric pressure is characterized as from about 30 to about 35 weight percent n-butane, from about 62 to about 66 weight percent 1,1,1,2,3,3,4,4,4-nonafluoro-n-butane and from about 1 to about 5 weight percent 1,1,2,2,3,3,4,4,4-nonafluoro-n-butane.
Claim 3
Dependent Claim
49 words
An admixture having a substantially constant boiling point characterized as from about 30 to about 35 weight percent n-butane, from about 62 to about 66 weight percent 1,1,1,2,3,3,4,4,4-nonafluoro-n-butane and from about 1 to about 5 weight percent 1,1,2,2,3,3,4,4,4-nonafluoro-n-butane at the admixtures substantially constant boiling point at substantially atmospheric pressure.
Claim 4
Dependent Claim
49 words
An admixture having a substantially constant boiling point characterized as from about 30 to about 35 weight percent n-butane, from about 62 to about 66 weight percent 1,1,1,2,3,3,4,4,4-nonafluoro-n-butane and from about 1 to about 5 weight percent 1,1,2,2,3,3,4,4,4-nonafluoro-n-butane at the admixtures substantially constant boiling point at substantially atmospheric pressure.
Claim 5
Dependent Claim
25 words
The azeotrope according to claim 2 characterized by a boiling point in the range of about -6° to -6.5° C. at about 740 mm pressure.
References Cited (Backward Citations)
US3887629A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-06-11 | 1982-12-11 | 1983-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-11 | 1986-12-11 | 1987-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-11 | 1990-12-11 | 1991-06-12 | $7700.00 | Window Closed / Lapsed |