Patent US3554903A successfully refreshed from Google Patents.
US3554903A
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Catalytic cracking process
Assignee: Shell USA Inc
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Filing: 1968-12-10
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Granted: 1971-01-12
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Expires: 1988-12-10
Abstract
Abstract A CATALYTIC CRACKING PROCESS HAVING HIGH CATALYST ACTIVITY AND LOW CATALYST CONSUMPTION, EFFECTED BY SEPARATING SUBSTANTIALLY ALL ENTRAINED CATALYST PARTICLES FROM THE REGENERATOR OFF-GAS STREAM, CLASSIFYING THE PARTICLES INTO A LARGE PARTICLE FRACTION AND A SMALLER PARTICLE FRACTION, AND RETURNING THE LARGER PARTICLE FRACTION TO THE CATALYTIC CRACKING PROCESS.
Inventors
- 👤 Joseph G Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:26
CPC Classifications
C; C10; C10G; C10G11/00; C10G11/14; C10G11/18; C10G11/185
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |