Patent US3565827A successfully refreshed from Google Patents.
US3565827A
Expired / Lapsed
US
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Preparation of activated carbon in serially disposed fluidized zones
Assignee: ConocoPhillips Co
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Filing: 1968-03-29
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Granted: 1971-02-23
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Expires: 1988-03-29
Abstract
Abstract ACTIVATED CARBON IS PREPARED FROM CARBONACEOUS MATERIAL IN A REACTOR HAVING A PLURALITY OF STAGES ARRANGED IN SERIES. THE CARBONACEOUS MATERIAL FED TO THE REACTOR HAS A PARTICLE SIZE RANGE SUCH THAT THE ACTIVATION GAS, PASSED UPWARDLY THROUGH EACH STAGE, MAINTAINS THE MATERIAL IN A FLUIDIZED STATE. MATERIAL FROM THE UPPER PORTION OF EACH STAGE PASSES TO THE LOWER PORTION OF THE NEXT STAGE THROUGH OVERFLOW MEANS. IN ORDER TO PREVENT BACKMIXING, EACH SUCCESSIVE STAGE IS ARRANGED WITH AN OVERFLOW LOWER THAN THE OVERFLOW OF THE PRECEDING STAGE.
Inventors
- 👤 John R Friday
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:20
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/30; C01B32/312; C01B32/336
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |