Patent US1918529A successfully refreshed from Google Patents.
Patent US3745110A successfully refreshed from Google Patents.
US3745110A
Expired / Lapsed
US
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Thermal decoking of delayed coking drums
Assignee: Marathon Oil Co
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Filing: 1971-05-05
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Granted: 1973-07-10
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Expires: 1991-05-05
Abstract
Abstract AFTER COMPLETION OF THE DELAYED COKING PROCESS AND BEFORE REMOVAL OF THE COKE FROM THE COKING DRUM, STREAM OR OTHER HOT GASES, E.G., AT 1100 TO 1500*F. ARE CIRCULATED THROUGH THE DRUM TO SHRINK THE COKE AWAY FROM THE DRUM WALLS AND FACILITATE DISCHARGE OF COKE FROM THE DRUM. PREFERABLY THE DRUM TAPERS GRADUALLY FROM BOTTOM TO TOP AND A BOTTOM OUTLET OF THE DRUM COMMUNICATES WITH A DEVICE FOR COMMINUTING THE COKE.
Inventors
- 👤 V Allred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:15
CPC Classifications
C; C10; C10B; C10B57/00; C10B57/005; C10B33/00
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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |