US2523138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of iron from its ores
Assignee: Engility LLC
•
Filing: 1947-09-12
•
Granted: 1950-09-19
•
Expires: 1967-09-12
Abstract
No abstract record available.
Inventors
- 👤 Oppegaard Assur Gjessing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:45
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/08; C21B13/14
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
89 words
PROCESS FOR PRODUCING METALLIC IRON FROM IRON ORE WHICH COMPRISES MIXING COMMINUTED IRON ORE WITH A COMMINUTED CARBONACEOUS REDUCING AGENT, HEATING SAID MIXTURE AT TEMPERATURES BETWEEN ABOUT 800*C. AND 1000*C. UNTIL FROM ABOUT 50% TO ABOUT 80% OF THE TOTAL REDUCIBLE IRON CONTENT OF SAID ORE IS REDUCED TO METALLIC STATE WHEREBY A FRIABLE PRODUCT IS OBTAINED CONTAINING METALLIC IRON AND PARTIALLY REDUCED IRON OXIDE, SUBJECTING THE PRODUCT TO MAGNETIC SEPARATION, AND THEREAFTER FURTHER REDUCING THE MAGNETIC CONCENTRATE CONSISTING ESSENTIALLY OF METALLIC IRON AND IRON OXIDE TO METALLIC IRON.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-18 | 1954-03-20 | 1954-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-18 | 1958-03-20 | 1958-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-18 | 1962-03-20 | 1962-09-19 | $7700.00 | Window Closed / Lapsed |