US3118757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and means for preheating ferrous oxide
Assignee: Renault SA
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Filing: 1961-03-27
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Granted: 1964-01-21
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Expires: 1981-03-27
Abstract
No abstract record available.
Inventors
- 👤 Peras Lucien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:44
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/0033; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
THE METHOD FOR PREHEATING FERROUS OXIDE AS PREPARATION FOR THE DIRECT REDUCTION OF SAID FERROUS OXIDE BY MEANS OF HYDROGEN IN A FLUIDIZED BED APPARATUS WHICH COMPRISES CONTINUOUSLY FEEDING FERROUS OXIDE IN POWDER FORM TO A FIRST PREHEATING ZONE, FLUIDIZIG AND PREHEATING SAID FERROUS OXIDE IN SAID FIRST PREHEATING ZONE BY PASSING UPWARDLY THERETHROUGH A CURRENT A MOISTURE-FREE GAS COMPRISING CO2 AND N2 AT A TEMPERATURE OF ABOUT 100* C., CONTINUOUSLY WITHDRAWING FERROUS OXIDE AT A TEMPERATURE OF ABOUT 100*C., FROM SAID FIRST PREHEATING ZONE AND PASSING THE SAME TO A SECOND PREHEATING ZONE, CONTINUOUSLY FLOWING SAID FERROUS OXIDE THROUGH SAID SECOND ZONE IN A PLURALITY OF SUCCESSIVE STAGES, FLUIDIZING AND FURTHER PREHEATING THE FERROUS OXIDE IN EACH STAGE BY A
Claim 2
Independent Claim
121 words
THE METHOD FOR PREHEATING FERROUS OXIDE AS PREPARATION FOR THE DIRECT REDUCTION OF SAID FERROUS OXIDE BY MEANS OF HYDROGEN IN A FLUIDIZED BED APPARATUS WHICH COMPRISES CONTINUOUSLY FEEDING FERROUS OXIDE IN POWDER FORM TO A FIRST PREHEATING ZONE, FLUIDIZIG AND PREHEATING SAID FERROUS OXIDE IN SAID FIRST PREHEATING ZONE BY PASSING UPWARDLY THERETHROUGH A CURRENT A MOISTURE-FREE GAS COMPRISING CO2 AND N2 AT A TEMPERATURE OF ABOUT 100* C., CONTINUOUSLY WITHDRAWING FERROUS OXIDE AT A TEMPERATURE OF ABOUT 100*C., FROM SAID FIRST PREHEATING ZONE AND PASSING THE SAME TO A SECOND PREHEATING ZONE, CONTINUOUSLY FLOWING SAID FERROUS OXIDE THROUGH SAID SECOND ZONE IN A PLURALITY OF SUCCESSIVE STAGES, FLUIDIZING AND FURTHER PREHEATING THE FERROUS OXIDE IN EACH STAGE BY A
References Cited (Backward Citations)
BE508600A
Cited
US1433854A
Cited
US2538201A
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US2600425A
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US2638414A
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US2711368A
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US2973260A
Cited
US2990269A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-01-20 | 1967-07-22 | 1968-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-20 | 1971-07-22 | 1972-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-20 | 1975-07-22 | 1976-01-21 | $7700.00 | Window Closed / Lapsed |