US4164471A
Expired / Lapsed
US
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Constant boiling admixtures
Assignee: Phillips Petroleum Co
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Filing: 1977-12-28
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Granted: 1979-08-14
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Expires: 1997-12-28
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-132) 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 M. Hutchinson, deceased
- 👤 executrix by Florence M. Hutchinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:35
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/504; C11D7/5045; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02803
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
30 words
A substantially constant boiling admixture of (A) 1,1,2-trifluoroethane and (B) 1,1,1-trifluoro-2-chloroethane wherein said (A) represents about 53.2 weight percent, and said (B) about 46.8 weight percent, at substantially atmospheric pressure.
Claim 2
Dependent Claim
30 words
A substantially constant boiling admixture of (A) 1,1,2-trifluoroethane and (B) 1,1,1-trifluoro-2-chloroethane wherein said (A) represents about 53.2 weight percent, and said (B) about 46.8 weight percent, at substantially atmospheric pressure.
Claim 3
Dependent Claim
23 words
The substantially constant boiling admixture according to claim 1 further characterized by a boiling point of about 40° C. at substantially atmospheric pressure.
Claim 4
Dependent Claim
23 words
The substantially constant boiling composition according to claim 1 characterized by a boiling point of about 40° C. at about 731 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) | 1982-08-13 | 1983-02-12 | 1983-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-13 | 1987-02-12 | 1987-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-13 | 1991-02-12 | 1991-08-14 | $7700.00 | Window Closed / Lapsed |