Patent US3660307A successfully refreshed from Google Patents.
US3660307A
Expired / Lapsed
US
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Process for regenerating fluorination catalysts of the chromoxy-fluoride group
Assignee: Hoechst AG
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Filing: 1969-04-04
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Granted: 1972-05-02
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Expires: 1989-04-04
Abstract
Abstract PROCESS FOR REGENERATING FLUORINATION CATALYSTS OF THE CHROMOXY-FLUORIDE GROUP, WHEREIN HYDROGEN FLUORIDE IS PASSED OVER THE CATALYST AT 100*-600*C. IN AN AMOUNT OF AT LEAST 5 G. PER LITER OF CATALYST PER HOUR. BY THE PROCESS THE INITIAL ACTIVITY OF SAID CATALYSTS CAN BE RESTORED IN AN ECONOMIC WAY.
Inventors
- 👤 Otto Scherer
- 👤 Paul Peter Rammelt
- 👤 Jurgen Korinth
- 👤 Peter Frisch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:52
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/06; B01J38/00; B01J38/04; B01J38/42; B01J38/46
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |