US4002573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azeotropes of 1,2-dichloro-1,1,2-trifluoroethane
Assignee: Phillips Petroleum Co
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Filing: 1975-09-05
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Granted: 1977-01-11
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Expires: 1995-09-05
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 Milton Hutchinson, deceased
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:19
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/504; C11D7/5059; C07; C07C; C07C19/00; C07C19/08; C07C19/10; C11D7/5045; C11D7/5068; C11D7/5077; C11D7/5086; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02809; C23G5/02812; C23G5/02825; C23G5/02829; C23G5/02838
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
35 words
A substantially constant boiling admixture of (A) 1,2-dichloro-1,1,2-trifluoroethane and (B) diethyl ether which at substantially atmospheric pressure is characterized as about 58 to 60 weight percent (A) and about 42 to 40 weight percent (B).
Claim 2
Dependent Claim
35 words
A substantially constant boiling admixture of (A) 1,2-dichloro-1,1,2-trifluoroethane and (B) diethyl ether which at substantially atmospheric pressure is characterized as about 58 to 60 weight percent (A) and about 42 to 40 weight percent (B).
Claim 3
Dependent Claim
25 words
The substantially constant boiling admixture according to claim 1 characterized by a boiling temperature of about 38°-39° C at a pressure of about 735-743 mm/Hg.
Claim 4
Dependent Claim
14 words
The substantially constant boiling admixture according to claim 1 further characterized as an azeotrope.
Claim 5
Dependent Claim
20 words
The azeotropic admixture according to claim 3 characterized by a boiling point of about 38.6° C at about 742.4 mm/Hg.
Claim 6
Dependent Claim
22 words
The azeotropic composition according to claim 4 wherein said (A) represents about 58.9 weight percent, and said (B) about 41.1 weight percent.
Claim 7
Dependent Claim
20 words
The azeotropic admixture according to claim 3 characterized by a boiling point of about 38.3° C at about 735.5 mm/Hg.
Claim 8
Dependent Claim
22 words
The azeotropic composition according to claim 6 wherein said (A) represents about 59.8 weight percent, and said (B) about 40.2 weight percent.
References Cited (Backward Citations)
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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) | 1980-01-11 | 1980-07-12 | 1981-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-11 | 1984-07-12 | 1985-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-11 | 1988-07-12 | 1989-01-11 | $7700.00 | Window Closed / Lapsed |