US4131559A
Expired / Lapsed
US
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Azeotropic compositions
Assignee: Phillips Petroleum Co
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Filing: 1977-12-23
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Granted: 1978-12-26
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Expires: 1997-12-23
Abstract
Abstract This invention relates to azeotropic compositions of 1,2-dichloro-1-fluoroethane or of 1,2-dichloro-1,2-difluoroethane with certain alcohols, ethers, or ketones.
Inventors
- 👤 Robert E. Reusser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:30
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/5068; C11D7/5077; C11D7/5081; C11D7/5086; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02809; C23G5/02825; C23G5/02829; C23G5/02835; C23G5/032
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
21 words
The azeotrope which at substantially atmospheric pressure is characterized as about 95 weight percent 1,2-dichloro-1,2-difluoroethane and about 5 weight percent ethanol.
Claim 2
Dependent Claim
21 words
The azeotrope which at substantially atmospheric pressure is characterized as about 95 weight percent 1,2-dichloro-1,2-difluoroethane and about 5 weight percent ethanol.
Claim 3
Dependent Claim
19 words
The azeotrope according to claim 1 characterized by a boiling point of about 56°-57° C. at substantially atmospheric pressure.
Claim 4
Dependent Claim
20 words
The azeotrope according to claim 1 characterized by a boiling point of about 56°-57° C. at about 748 millimeters pressure.
Claim 5
Dependent Claim
20 words
The azeotrope which at substantially atmospheric pressure is characterized as about 98.7 weight percent 1,2-dichloro-1,2-difluoroethane and 1.3 weight percent isopropanol.
Claim 6
Dependent Claim
20 words
The azeotrope which at substantially atmospheric pressure is characterized as about 98.7 weight percent 1,2-dichloro-1,2-difluoroethane and 1.3 weight percent isopropanol.
Claim 7
Dependent Claim
19 words
The azeotrope according to claim 4 characterized by a boiling point of about 57° C. at substantially atmospheric pressure.
Claim 8
Dependent Claim
20 words
The azeotrope according to claim 4 characterized by a boiling point of about 57° C. at about 744 millimeters pressure.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-25 | 1982-06-26 | 1982-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-25 | 1986-06-26 | 1986-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-25 | 1990-06-26 | 1990-12-26 | $7700.00 | Window Closed / Lapsed |