Patent US4035258A successfully refreshed from Google Patents.
US4035258A
Expired / Lapsed
US
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Azeotropic compositions
Assignee: Phillips Petroleum Co
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Filing: 1975-08-29
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Granted: 1977-07-12
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Expires: 1995-08-29
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
2026-10-28 12:56
CPC Classifications
C; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02809; C23G5/02825; C23G5/02829; C23G5/02832; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/5068; C11D7/5077; C11D7/5081; C11D7/5086; C23G5/02835
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
22 words
The azeotrope which at substantially atmospheric pressure is characterized as about 81.2 weight per cent 1,2-dichloro-1-fluoroethane and about 18.8 weight percent ethanol.
Claim 2
Dependent Claim
22 words
The azeotrope which at substantially atmospheric pressure is characterized as about 81.2 weight per cent 1,2-dichloro-1-fluoroethane and about 18.8 weight percent ethanol.
Claim 3
Dependent Claim
20 words
The azeotrope according to claim 1 characterized by a boiling point of about 65° C. at about 749 millimeters pressure.
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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) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |