US3661967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyano containing polyfluoroaromatic compounds
Assignee: Dow Chemical Co
•
Filing: 1968-09-25
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Granted: 1972-05-09
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Expires: 1988-09-25
Abstract
Abstract COMPOUNDS OF THE FOLLOWING TYPE ARE PRVIDED: (2,3,5,6-TETRA(F-),4-X-PHENYL)-C(-CF3)(-F)-O-R-A WHEREIN A IS A HALOGEN OR 2,3,5,6-TETRA(F-),4-X-PHENYL WHEREIN R IS A SATURATED, ACCYCLIC, PERHALO, ORGANIC GROUP CONSISTING ESSENTIALLY OF CARBON, FLUORINE AND OPTIONALLY OXYGEN; AND WHEREIN X IS AN ELECTRON WITHDRAWING SUBSTITUENT OTHER THAN HALOGEN OR A GROUP WHICH READILY UNDERGOES NUCLEOPHILIC ATTACK. ALSO PROVIDED IS A PROCESS FOR THE PREPARATION OF THESE COMPOUNDS, WHICH COMPRISES THE REACTION OF 1,2,3,4,5-PENTA(F-),6-X-BENZENE WHEREIN X IS AS DEFINED ABOVE, WITH A VINYL ETHER, IN THE PRESENCE OF AN ALKALI METAL FLUORIDE.
Inventors
- 👤 Richard W Anderson
- 👤 Hughie R Frick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:14
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/08
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |