US2684296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction of iron ores
Assignee: NL Industries Inc
•
Filing: 1951-09-20
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Granted: 1954-07-20
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Expires: 1971-09-20
Abstract
No abstract record available.
Inventors
- 👤 Moklebust Olav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:06
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/008
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
IN A PROCESS IN WHICH COMMUNICATED IRON ORE IS ADMIXED WITH A CARBONACEOUS REDUCING AGENT, HEATED AT A TEMPERATURE BETWEEN 600* C. AND 1200* C. TO EFFECT REDUCTION AGITATION OF THE CHARGE AND SUBSEQUENTLY COOLED BY EXPOSURE TO COOLING GASES, THE STEPS WHICH COMPRISES COVERING THE CHARGE BEFORE REDUCTION WITH A LAYER OF NON-COMBUSTIBLE OXIDIC MATERIAL, SAID MATERIAL HAVING A SINTERING TEMPERATURE ABOVE THE REDUCTION TEMPERATURE EMPLOYED, BUT BELOW THE SINTERING TEMPERATURE OF THE ADMIXTURE OF REDUCING AGENT AND ORE, SAID OXIDIC MATERIAL BEING COMPOSED OF ORE OF THE SAME COMPOSITION AS THE CHARGE AND BEING OF SUBSTANTIALLY FINER PARTICLE SIZE, THEREBY TO FORM A SINTERED PROTECTIVE LAYER OVER SAID CHARGE WHICH IS RETAINED IN COMMINUTE FORM AFTER REDUCTION AND DURING SUBSEQUENT EXPOSURE TO COOLILNG GASES, AND AFTER COOLING, SEPARATING SAID SINTERED PROTECTIVE LAYER FROM THE SO-REDUCED ORE.
Claim 2
Dependent Claim
138 words
IN A PROCESS IN WHICH COMMUNICATED IRON ORE IS ADMIXED WITH A CARBONACEOUS REDUCING AGENT, HEATED AT A TEMPERATURE BETWEEN 600* C. AND 1200* C. TO EFFECT REDUCTION AGITATION OF THE CHARGE AND SUBSEQUENTLY COOLED BY EXPOSURE TO COOLING GASES, THE STEPS WHICH COMPRISES COVERING THE CHARGE BEFORE REDUCTION WITH A LAYER OF NON-COMBUSTIBLE OXIDIC MATERIAL, SAID MATERIAL HAVING A SINTERING TEMPERATURE ABOVE THE REDUCTION TEMPERATURE EMPLOYED, BUT BELOW THE SINTERING TEMPERATURE OF THE ADMIXTURE OF REDUCING AGENT AND ORE, SAID OXIDIC MATERIAL BEING COMPOSED OF ORE OF THE SAME COMPOSITION AS THE CHARGE AND BEING OF SUBSTANTIALLY FINER PARTICLE SIZE, THEREBY TO FORM A SINTERED PROTECTIVE LAYER OVER SAID CHARGE WHICH IS RETAINED IN COMMINUTE FORM AFTER REDUCTION AND DURING SUBSEQUENT EXPOSURE TO COOLILNG GASES, AND AFTER COOLING, SEPARATING SAID SINTERED PROTECTIVE LAYER FROM THE SO-REDUCED ORE.
References Cited (Backward Citations)
US2352316A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-19 | 1958-01-18 | 1958-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-19 | 1962-01-18 | 1962-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-19 | 1966-01-18 | 1966-07-20 | $7700.00 | Window Closed / Lapsed |