Patent US3661800A successfully refreshed from Google Patents.
US3661800A
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US
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Staged fluidized solids contacting process in oxidation regeneration of catalysts
Assignee: MW Kellogg Co
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Filing: 1970-06-17
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Granted: 1972-05-09
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Expires: 1990-06-17
Abstract
Abstract A METHOD FOR STAGE REGENERATION OF PARTICULATE, FLUIDIZED MATERIAL IN A UNITARY VESSEL HAVING SUPERIMPOSED BEDS WHEREIN REGENERATION GAS LEAVING A SECOND STAGE IS PASSED THROUGH A FIRST STAGE. THE METHOD IS PARTICULARLY APPLICABLE TO THE REGENERATION OF HYDROCARBON CRACKING CATALYST TO LOW RESIDUAL LEVELS OF CARBON.
Inventors
- 👤 Robert W Pfeiffer
- 👤 Henry P Wickham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:07
CPC Classifications
C; C10; C10G; C10G11/00; C10G11/14; C10G11/18; C10G11/182
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |