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Patent US2876091A successfully refreshed from Google Patents.
US2876091A
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Method of reducing iron oxide
Assignee: United States Steel Corp
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Filing: 1957-12-31
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Granted: 1959-03-03
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Expires: 1977-12-31
Abstract
No abstract record available.
Inventors
- 👤 Thomas F Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:22
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/0033; C21B13/008; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
A METHOD OF REDUCING HIGH PURITY IRON OXIDE FINES WHICH TEND TO STICK WHEN HEATED ABOVE 1100 F. IN THE PRESENCE OF A REDUCING GAS COMPRISING MIXING SAID FINES WITH HIGH GANGUE IRON ORE FINES HAVING A SILICIOUS GANGUE CONTENT OF 5 TO 25 PERCENT BY WEIGHT TO PRODUCE A MIXTURE HAVING A GANGUE CONTENT OF 2 TO 3 PERCENT BY WEIGHT, INTRODUCING SAID MIXTURE TO A FLUIDIZED BED MAINTAINED AT A MINIMUM TEMPERATURE OF 1200 F., AND INTRODUCING A REDUCING GAS TO THE BED.
Claim 2
Independent Claim
85 words
A METHOD OF REDUCING HIGH PURITY IRON OXIDE FINES WHICH TEND TO STICK WHEN HEATED ABOVE 1100 F. IN THE PRESENCE OF A REDUCING GAS COMPRISING MIXING SAID FINES WITH HIGH GANGUE IRON ORE FINES HAVING A SILICIOUS GANGUE CONTENT OF 5 TO 25 PERCENT BY WEIGHT TO PRODUCE A MIXTURE HAVING A GANGUE CONTENT OF 2 TO 3 PERCENT BY WEIGHT, INTRODUCING SAID MIXTURE TO A FLUIDIZED BED MAINTAINED AT A MINIMUM TEMPERATURE OF 1200 F., AND INTRODUCING A REDUCING GAS TO THE BED.
References Cited (Backward Citations)
US2758021A
Cited
US2807536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-02 | 1962-09-01 | 1963-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-02 | 1966-09-01 | 1967-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-02 | 1970-09-01 | 1971-03-03 | $7700.00 | Window Closed / Lapsed |