US3940342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azeotrope of 1,2-dichloro-1,1,2-trifluoroethane and trichlorofluoromethane
Assignee: Phillips Petroleum Co
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Filing: 1973-09-13
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Granted: 1976-02-24
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Expires: 1993-09-13
Abstract
Abstract Constant boiling binary admixtures are formed by 1,2-dichloro-1,1,2-trifluoroethane with trichlorofluoromethane, with diethyl ether, and with dichloromethane. A constant boiling ternary admixture is formed by 1,2-dichloro-1,1,2-trifluoroethane, diethyl ether, and 1,2-dibromo-1,1,2,2-tetrafluoroethane.
Inventors
- 👤 William M. Hutchinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:30
CPC Classifications
C; C07; C07C; C07C19/00; C07C19/08; C07C19/10; C07C19/12; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/504; C11D7/5045; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02809; C23G5/02812; C23G5/02825; C23G5/02829; C23G5/02838
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
35 words
The substantially constant boiling admixture of (A) 1, 2 -dichloro- 1, 1, 2-trifluoroethane and (B) trichlorofluoromethane which at substantially atmospheric pressure is characterized as about 28-29 weight percent (A) and about 72-71 weight percent (B).
Claim 2
Dependent Claim
35 words
The substantially constant boiling admixture of (A) 1, 2 -dichloro- 1, 1, 2-trifluoroethane and (B) trichlorofluoromethane which at substantially atmospheric pressure is characterized as about 28-29 weight percent (A) and about 72-71 weight percent (B).
Claim 3
Dependent Claim
14 words
A substantially constant boiling admixture according to claim 1 further characterized as an azeotrope.
Claim 4
Dependent Claim
20 words
The azeotropic admixture according to claim 2 characterized by a boiling point of about 23.5° C at about 742.9 mm/Hg.
Claim 5
Dependent Claim
22 words
The azeotropic composition according to claim 2 wherein said (A) represents about 28.4 weight percent, and said (B) about 71.6 weight percent.
Claim 6
Dependent Claim
25 words
A substantially constant boiling admixture according to claim 1 characterized by a boiling temperature of about 23°-24° C at a pressure of about 742-744 mm/Hg.
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) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |