Patent US3311657A successfully refreshed from Google Patents.
US3311657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polyfluoroaliphatic carboxylic acids from polyfluorinated olefins
Assignee: EIDP Inc
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Filing: 1964-09-01
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Granted: 1967-03-28
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Expires: 1984-09-01
Abstract
No abstract record available.
Inventors
- 👤 Donald P Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:13
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/15
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
A PROCESS FOR PREPARING ALKALI METAL SALTS OF POLYFLUOROALIPHATIC CARBOXYLIC ACIDS WHICH COMPRISES REACTING A POLYFLUORINATED OLEFIN OF THE FORMULA CF2=CXY, WHERE X IS FROM THE GROUP CONSISTING OF CL, F, AND CF=CF2 AND Y IS FROM THE GROUP CONSISTING OF CL, F, AND CF3, WITH CARBON DIOXIDE AND AN ALKALI METAL FLUORIDE IN THE PRESENCE OF A LIQUID REACTION MEDIUM SELECTED FROM THE GROUP CONSISTING OF ACETONITRILE AND POLYALKYLENEGLYCOL DIALKYLETHERS OF THE FORMULA RO(CPH2PO)NR, WHERE R IS LOWER ALKYL OF 1 TO 6 CARBON ATOMS, P IS 2 TO 4, AND N IS FROM 1 TO 4, AND RECOVERING FROM SAID LIQUID REACTION MEDIUM THE ALKALI METAL SALT OF APOLYFLUOROALIPHATIC CARBOXYLIC ACID OF THE STRUCTURE CF2CXYCO2ME, WHERE X AND Y HAVE THE MEANINGS SET FORTH ABOVE, AND ME IS AN ALKALI METAL.
Claim 2
Dependent Claim
133 words
A PROCESS FOR PREPARING ALKALI METAL SALTS OF POLYFLUOROALIPHATIC CARBOXYLIC ACIDS WHICH COMPRISES REACTING A POLYFLUORINATED OLEFIN OF THE FORMULA CF2=CXY, WHERE X IS FROM THE GROUP CONSISTING OF CL, F, AND CF=CF2 AND Y IS FROM THE GROUP CONSISTING OF CL, F, AND CF3, WITH CARBON DIOXIDE AND AN ALKALI METAL FLUORIDE IN THE PRESENCE OF A LIQUID REACTION MEDIUM SELECTED FROM THE GROUP CONSISTING OF ACETONITRILE AND POLYALKYLENEGLYCOL DIALKYLETHERS OF THE FORMULA RO(CPH2PO)NR, WHERE R IS LOWER ALKYL OF 1 TO 6 CARBON ATOMS, P IS 2 TO 4, AND N IS FROM 1 TO 4, AND RECOVERING FROM SAID LIQUID REACTION MEDIUM THE ALKALI METAL SALT OF APOLYFLUOROALIPHATIC CARBOXYLIC ACID OF THE STRUCTURE CF2CXYCO2ME, WHERE X AND Y HAVE THE MEANINGS SET FORTH ABOVE, AND ME IS AN ALKALI METAL.
References Cited (Backward Citations)
US2798091A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-27 | 1970-09-26 | 1971-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-27 | 1974-09-26 | 1975-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-27 | 1978-09-26 | 1979-03-28 | $7700.00 | Window Closed / Lapsed |