US3565603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing optimum yields of ferroalloys in electric reduction furnaces
Assignee: Knapsack AG
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Filing: 1968-05-31
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Granted: 1971-02-23
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Expires: 1988-05-31
Abstract
Abstract AS THE REDUCTION OF OXIDIC IRON ORES PROGRESSES IN AN ELECTRIC ARC FURNACE OF SUBSTANTIALLY CONSTANT FURNACE SPACE, THE CURRENT INTENSITY NEEDED TO MAINTAIN THE REACTION VARIES. IT HAS BEEN FOUND THAT WITHIN DEFINED LIMITS THERE IS AN INVERSE RELATIONSHIP BETWEEN THE OPTIMUM INTERVALS AT WHICH THE FURNACE IS TO BE TAPPED AND THE CURRENT INTENSITY.
Inventors
- 👤 Helmut Klee
- 👤 Dieter Schorning
- 👤 Hermann Niermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:45
CPC Classifications
C; C21; C21B; C21B11/00; C21B11/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |