US3936387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azeotrope of 1,2-dichloro-1-fluoroethane and methanol
Assignee: Phillips Petroleum Co
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Filing: 1973-08-27
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Granted: 1976-02-03
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Expires: 1993-08-27
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
2026-10-31 20:20
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
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
28 words
The azeotrope of (A) 1, 2-dichloro-1-fluoroethane and (B) methanol which at substantially atmospheric pressure is characterized as about 73.5 weight percent (A) and about 26.5 weight percent (B).
Claim 2
Dependent Claim
28 words
The azeotrope of (A) 1, 2-dichloro-1-fluoroethane and (B) methanol which at substantially atmospheric pressure is characterized as about 73.5 weight percent (A) and about 26.5 weight percent (B).
Claim 3
Dependent Claim
19 words
The azeotrope according to claim 1 characterized by a boiling point of about 56° C. at substantially atmospheric pressure.
Claim 4
Dependent Claim
21 words
The azeotrope as defined in claim 1 characterized by a boiling point of about 56° C. at about 742 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) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |