Patent US3769200A successfully refreshed from Google Patents.
US3769200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing high purity coke by delayed coking
Assignee: Union Oil Company of California
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Filing: 1971-12-06
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Granted: 1973-10-30
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Expires: 1991-12-06
Abstract
Abstract A METHOD FOR REMOVING INORGANIC COMPONENTS FROM A COKING FEEDSTOCK IS DISCLOSED. IN THE METHOD A FEEDSTOCK CONTAINING INORGANIC IMPURITIES IS PASSED THROUGH A FIRST COKING ZONE MAINTAINED AT DELAYED COKING CONDITIONS TO REDUCE FROM 5 TO 40 WEIGHT PERCENT OF THE FEEDSTOCK TO COKE AND VAPORS. A LIQUID EFFLUENT IS WITHDRAWN FROM THE FIRST ZONE AND PASSED THROUGH A SECOND COKING ZONE MAINTAINED AT A TEMPERATURE OF 775* TO 1000*F. AND A PRESSURE OF 1 TO 20 ATMOSPHERES ABSOLUTE. THE INORGANIC COMPONENTS ARE FILTERED FROM THE FEEDSTOCK BY COKE DEPOSITED IN THE FIRST COKING ZONE, THEREBY IMPROVING THE PURITY OF THE COKE PRODUCED IN THE SECOND ZONE. D R A W I N G
Inventors
- 👤 H Folkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:44
CPC Classifications
C; C10; C10B; C10B57/00; C10B57/04; C10B57/045; C10B55/00
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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |