US3574775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorination of perhalo compounds
Assignee: Imperial Smelting Corp Ltd
•
Filing: 1968-04-22
•
Granted: 1971-04-13
•
Expires: 1988-04-22
Abstract
Abstract USE OF THE SOLVENT SULPHOLANE (OTHERWISE KNOWN AS TETRAHYDROTHIOPHEN 1,1-DIOXIDE OR TETRAMETHYLENE SULFONE) IN A HALOGEN EXCHANGE REACTION BETWEEN A CHLORINATED BENZENE FULLY SUBSTITUTED WITH HALOGEN ATOMS AND A DRY ALKALI METAL FLUORIDE ENABLES ONE TO PRODUCE FLUORINATED BENZENES FULLY SUBSTITUTED WITH HALOGEN ATOMS MORE THAN THREE OF WHICH ARE FLUORINE ATOMS, E.G. CHLOROPENTAFLUOROBENZENE AND HEXAFLUOROBENZENE.
Inventors
- 👤 George Fuller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:44
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/093; C07C17/20; C07C17/202; C07C17/208
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |