US3033673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of reducing iron oxides
Assignee: Elektrokemisk AS
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Filing: 1961-05-01
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Granted: 1962-05-08
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Expires: 1981-05-01
Abstract
No abstract record available.
Inventors
- 👤 Collin Fredrik Christen
- 👤 Basen Toralv
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:04
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/14; C21B13/0046; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
PROCESS FOR THE SOLID STATE REDUCTION OF IRON OXIDES WHICH COMPRISES FORMING PELLETS OF THE OXIDE WITH A CARBONACEOUS REDUCING AGENT IN AMOUNT TO REDUCE THE OXIDE AND HEATING SUCH PELLETS IN A STREAM OF GAS COMPRISING THE PRODUCTS OF COMBUSTION OF A HYDROCARBON AND AIR AT A TEMPERATURE OF FROM ABOUT 900*C. TO 1150*C., SUCH GAS HAVING A RATIO OF CO TO CO+CO2 OF AT LEAST 0.67 AND IN AN AMOUNT SUFFICIENT TO HEAT THE PELLETS TO AT LEAST ABOVE 900*C. WHEREBY THE OXIDE IS REDUCED BY A CARBONACEOUS REDUCING AGENT WITHOUT SUBSTANTIAL REOXIDATION.
Claim 2
Dependent Claim
95 words
PROCESS FOR THE SOLID STATE REDUCTION OF IRON OXIDES WHICH COMPRISES FORMING PELLETS OF THE OXIDE WITH A CARBONACEOUS REDUCING AGENT IN AMOUNT TO REDUCE THE OXIDE AND HEATING SUCH PELLETS IN A STREAM OF GAS COMPRISING THE PRODUCTS OF COMBUSTION OF A HYDROCARBON AND AIR AT A TEMPERATURE OF FROM ABOUT 900*C. TO 1150*C., SUCH GAS HAVING A RATIO OF CO TO CO+CO2 OF AT LEAST 0.67 AND IN AN AMOUNT SUFFICIENT TO HEAT THE PELLETS TO AT LEAST ABOVE 900*C. WHEREBY THE OXIDE IS REDUCED BY A CARBONACEOUS REDUCING AGENT WITHOUT SUBSTANTIAL REOXIDATION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-07 | 1965-11-06 | 1966-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-07 | 1969-11-06 | 1970-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-07 | 1973-11-06 | 1974-05-08 | $7700.00 | Window Closed / Lapsed |