US3712855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of calcined petroleum coke particle size
Assignee: Marathon Oil Co
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Filing: 1970-05-06
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Granted: 1973-01-23
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Expires: 1990-05-06
Abstract
Abstract THE PARTICLE SIZE OF CALCINED PETROLEUM COKE PRODUCT CAN BE CONTROLLED BY EITHER (1) CONTACTING COKE WITH 2-21 MOLE PERCENT OXYGEN ATMOSPHERE AT ABOUT 450-600*F. FOR 1/2-16 HOURS TO PREVENT AN INCREASE IN PARTICLE SIZE DURING LATER CALCINING, OR (2) HIGH VOLATILE PETROLEUM COKE FINES CAN BE CONSOLIDATED BY CALCINING THEM AT FROM ABOUT 1800 TO ABOUT 3000*F. FOR ABOUT 1/2 TO ABOUT 2 HOURS UNDER AN ATMOSPHERE SUBSTANTIALLY FREE FROM OXYGEN.
Inventors
- 👤 V Allred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:16
CPC Classifications
C; C10; C10L; C10L9/00; C10L9/02; C10L9/06; 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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |