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Patent US2691052A successfully refreshed from Google Patents.
US2691052A
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Purification of perfluorocompounds
Assignee: Phillips Petroleum Co
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Filing: 1951-09-12
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Granted: 1954-10-05
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Expires: 1971-09-12
Abstract
No abstract record available.
Inventors
- 👤 Martin R Cines
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:27
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/38; C07C17/395
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
40 words
THE PURIFICATION OF PERFLUORODIMETHYLCYCLOHEXANE WHICH COMPRISES AGITATING THE SAID COMPOUND WITH DI-NORMAL-PROPYLAMINE TO FORM A REACTION PRODUCT BY INTERACTION OF THE SAID DI-NORMAL-PROPYLAMINE WITH IMPURITIES CONTAININE IN SAID PERFLUORODIMETHYLCYCLOHEXANE AND THAN REMOVING THE SAID REACTION PRODUCT FROM THE SAID PERFLUORODIMETHYLCYCLOHEXANE.
References Cited (Backward Citations)
US2558624A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-04 | 1958-04-05 | 1958-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-04 | 1962-04-05 | 1962-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-04 | 1966-04-05 | 1966-10-05 | $7700.00 | Window Closed / Lapsed |