US4092262A
Expired / Lapsed
US
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Azeotropic compositions
Assignee: Phillips Petroleum Co
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Filing: 1977-03-22
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Granted: 1978-05-30
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Expires: 1997-03-22
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
2026-10-30 00:50
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; C23G5/02832; C23G5/02835
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
23 words
The azeotrope which at substantially atmospheric pressure is characterized as about 90.4 weight per cent 1,2-dichloro-1,2-difluoroethane and about 9.6 weight per cent methanol.
Claim 2
Dependent Claim
23 words
The azeotrope which at substantially atmospheric pressure is characterized as about 90.4 weight per cent 1,2-dichloro-1,2-difluoroethane and about 9.6 weight per cent methanol.
Claim 3
Dependent Claim
19 words
The azeotrope according to claim 1 characterized by a boiling point of about 52° C. at substantially atmospheric pressure.
Claim 4
Dependent Claim
20 words
The azeotrope according to claim 1 characterized by a boiling point of about 52° C. at about 741 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) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |