US4024086A
Expired / Lapsed
US
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Constant boiling admixtures
Assignee: Phillips Petroleum Co
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Filing: 1975-08-06
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Granted: 1977-05-17
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Expires: 1995-08-06
Abstract
Abstract Constant boiling binary admixtures are formed by 1,2-dichloro-1,1-difluoroethane (F-132B) with acetone, with methanol, and with ethanol; and a constant boiling ternary admixture is formed with diethyl ether and ethanol. Constant boiling binary admixtures are formed by 1,1,2-trifluoroethane (F-143) with octafluorocyclobutane, with 1,2-dichloro-1,1,2,2-tetrafluoroethane, with dichlorofluoromethane, with trichlorofluoromethane, with 1,1,2-trichloro-1,2,2-trifluoroethane, and with 1,1,1-trifluoro-2-chloroethane.
Inventors
- 👤 William Milton Hutchinson, deceased
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:42
CPC Classifications
C; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02803; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/504; C11D7/5045
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
33 words
A substantially constant boiling admixture of (A) 1,1,2-trifluoroethane and (B) octafluorocyclobutane which at substantially atmospheric pressure is characterized by a composition of about 21.6 weight percent (A) and about 78.4 weight percent (B).
Claim 2
Dependent Claim
33 words
A substantially constant boiling admixture of (A) 1,1,2-trifluoroethane and (B) octafluorocyclobutane which at substantially atmospheric pressure is characterized by a composition of about 21.6 weight percent (A) and about 78.4 weight percent (B).
Claim 3
Dependent Claim
21 words
The azeotropic admixture according to claim 1 characterized by a boiling point of about 26° C. at about 741 mm Hg.
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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) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |