US2648600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentration of iron ore
Assignee: United Steel Companies Ltd
•
Filing: 1950-01-11
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Granted: 1953-08-11
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Expires: 1970-01-11
Abstract
No abstract record available.
Inventors
- 👤 Reeve Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:59
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/14; B; B03; B03B; B03B1/00; B03B1/02; C22B1/02; C22B34/00; C22B34/10; C22B34/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A PROCESS FOR THE CONCENTRATION OF IRON ORE CONTAINING LIME IN THE FORM OF THE CARBONATE IN AN AMOUNT OF ABOUT 24% LIME (CALCULATED AS CAO) IN WHICH THE ORE IS FIRST ROASTED IN AN OXIDIZING ATMOSPHERE AT A TEMPERATURE BETWEEN ABOUT 900* C. AND 1050* C. SO AS TO CAUSE THE PRODUCTION OF FREE LIME FROM THE LIME CONTENT OF THE ORE WITHOUT CAUSING THE LIME TO COMBINE WITH THE IRON, THEREAFTER ROASTED IN A REDUCING ATMOSPHERE AT A LOWER TEMPERATURE TO CONVERT THE IRON SESQUIOXIDE TO FERROSO-FERRIC OXIDE AND MAINTAINED IN A REDUCING ATMOSPHERE AT LEAST UNTIL ITS TEMPERATURE HAS FALLEN TO 700* C. AND THEREAFTER DIVIDED MAGNETICLALY INTO A CONCENTRATE RELATIVELY ENRICHED IN PERCENTAGE OF IRON AND CONTAINING THE GREATER PART OF THE IRON AND TAILINGS WHICH CONTAIN A SUBSTANTIAL PROPORTION OF FREE LIME.
Claim 2
Dependent Claim
137 words
A PROCESS FOR THE CONCENTRATION OF IRON ORE CONTAINING LIME IN THE FORM OF THE CARBONATE IN AN AMOUNT OF ABOUT 24% LIME (CALCULATED AS CAO) IN WHICH THE ORE IS FIRST ROASTED IN AN OXIDIZING ATMOSPHERE AT A TEMPERATURE BETWEEN ABOUT 900* C. AND 1050* C. SO AS TO CAUSE THE PRODUCTION OF FREE LIME FROM THE LIME CONTENT OF THE ORE WITHOUT CAUSING THE LIME TO COMBINE WITH THE IRON, THEREAFTER ROASTED IN A REDUCING ATMOSPHERE AT A LOWER TEMPERATURE TO CONVERT THE IRON SESQUIOXIDE TO FERROSO-FERRIC OXIDE AND MAINTAINED IN A REDUCING ATMOSPHERE AT LEAST UNTIL ITS TEMPERATURE HAS FALLEN TO 700* C. AND THEREAFTER DIVIDED MAGNETICLALY INTO A CONCENTRATE RELATIVELY ENRICHED IN PERCENTAGE OF IRON AND CONTAINING THE GREATER PART OF THE IRON AND TAILINGS WHICH CONTAIN A SUBSTANTIAL PROPORTION OF FREE LIME.
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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) | 1956-08-10 | 1957-02-09 | 1957-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-10 | 1961-02-09 | 1961-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-10 | 1965-02-09 | 1965-08-11 | $7700.00 | Window Closed / Lapsed |