Patent US2663632A successfully refreshed from Google Patents.
US2663632A
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Reduction of iron ores
Assignee: NL Industries Inc
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Filing: 1951-09-06
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Granted: 1953-12-22
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Expires: 1971-09-06
Abstract
No abstract record available.
Inventors
- 👤 Oppegaard Assur Gjessing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:44
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/14; C21B13/146; C21B13/0066; C21B13/0073; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A PROCESS FOR REDUCTION OF IRON ORES WHICH COMPRISES ADMIXING COMMINUTED IRON ORE WITH A SOLID REDUCING AGENT AND HEATING SAID MIXTURE TO A TEMPERATURE OF BETWEEN 900*C. TO 1100* C UNTIL FROM 50% TO 80% OF THE IRON CONTENT OF SAID ORE IS REDUCED TO METALLIC IRON AND SUBSEQUENTLY TREATING SAID ORE WHILE STILL HOT WITH A REDUCING GAS IN A SEPARATE FURNACE WITHOUT ADDITION OF EXTERNAL HEAT TO FURTHER REDUCE THE IRON CONTENT THEREOF AND ALSO TO COOL THE REDUCED MATERIAL.
Claim 2
Dependent Claim
83 words
A PROCESS FOR REDUCTION OF IRON ORES WHICH COMPRISES ADMIXING COMMINUTED IRON ORE WITH A SOLID REDUCING AGENT AND HEATING SAID MIXTURE TO A TEMPERATURE OF BETWEEN 900*C. TO 1100* C UNTIL FROM 50% TO 80% OF THE IRON CONTENT OF SAID ORE IS REDUCED TO METALLIC IRON AND SUBSEQUENTLY TREATING SAID ORE WHILE STILL HOT WITH A REDUCING GAS IN A SEPARATE FURNACE WITHOUT ADDITION OF EXTERNAL HEAT TO FURTHER REDUCE THE IRON CONTENT THEREOF AND ALSO TO COOL THE REDUCED MATERIAL.
References Cited (Backward Citations)
US1403576A
Cited
US2296522A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-21 | 1957-06-22 | 1957-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-21 | 1961-06-22 | 1961-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-21 | 1965-06-22 | 1965-12-22 | $7700.00 | Window Closed / Lapsed |