Patent US3684446A successfully refreshed from Google Patents.
US3684446A
Expired / Lapsed
US
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Method for high-temperature treatment of petroleum coke
Assignee: Superior Graphite Co
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Filing: 1970-02-24
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Granted: 1972-08-15
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Expires: 1990-02-24
Abstract
Abstract THE INVENTION PROVIDES A METHOD AND APPARATUS FOR HIGH-TEMPERATURE TREATMENT OF PETROLEUM COKE. IN CARRYING OUT THE METHOD, CALCINED PERTROLEUM COKE, WHICH IS PREFERABLY HOT, IS INTRODUCED INTO A GRAPHITIZING ZONE AND HEATED BY DIRECT ELECTRICAL RESISTANCE. THE COKE IS CONTINUOUSLY AGITATED DURING THE HEATING, AND IS MOVED DOWNWARDLY THROUGH THE GRAPHITIZING ZONE. AFTER PASSING THROUGH THE GRAPHITIZING ZONE, THE COKE IS CONTINUOUSLY TRANSFERRED TO A TEMPERING AND COOLING ZONE, WHERE IT IS CONTINUOUSLY AGITATED. IF IT IS DESIRED TO DESULFURIZE THE COKE, IT IS HEATED TO AT LEAST ABOUT 1700*C., WHILE GRAPHITIZATION REQUIRES A TEMPERATURE OF AT LEAST ABOUT 2200*C.
Inventors
- 👤 Richard F Markel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:51
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/60; C; C10; C10L; C10L9/00; C10L9/08
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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |