US3689374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for separating halogenated hydrocarbons by extractive distillation
Assignee: Phillips Petroleum Co
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Filing: 1971-05-10
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Granted: 1972-09-05
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Expires: 1991-05-10
Abstract
Abstract A PROCESS FOR SEPARATING 1,1,2-TRICHLOROTRIFLUOROETHANE FROM A FIRST MIXTURE CONSISTING ESSENTIALLY OF 1,1,2-TRICHLOROTRIFLUOROETHANE AND 1,2-DICHLORO-1,1-DIFUOOETHANE BY ADDING ONE OF A GLYCOL OR GLYCOL ETHER TO THE FIRST MIXTURE TO FORM A RESULTANT SECOND MXTURE AND THEREAFTER EXTRACTIVELY DISTILLING THE SECOND MIXTURE IN AN EXTRACTIVE DISTILLATION ZONE TO SEPARATE THE 1,1,2-TRICHLOROTRIFLUOROETHANE FROM THE 1,2-DICHLORO-1,1-DIFLUOROETHANE.
Inventors
- 👤 Donald O Hanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:02
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/38; C07C17/383; C07C17/386
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |