US2549994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of ferromanganese
Assignee: Individual
•
Filing: 1948-08-11
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Granted: 1951-04-24
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Expires: 1968-08-11
Abstract
No abstract record available.
Inventors
- 👤 Marvin J Udy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:52
CPC Classifications
C; C21; C21C; C21C7/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
117 words
THE METHOD OF PRODUCING FERRMONAGANESE WHICH COMPRISES SUBJECTING A CHARGE COMPRISING IRON OXIDE, MANGANESE OXIDE, LIME AND SILICA TO A SINTERING TREATMENT AT A TEMPERATURE IN THE RANGE 1100* C. TO 1350* C. UNDER REDUCING CONDITIONS AND PRODUCING A HIGH-TEMPERATURE SINTERED PRODUCT CONTAINING A PORTION OF THE IRON OF THE IRON OXIDE IN THE METALLIC STATE, SUBJECTING THE HIGH-TEMPERATURE SINTERED PRODUCT TO A REDUCING TREATMENT IN AN OPEN ARC ELECTRIC FURNACE AND FORMING A MOLTEN BATH COMPRISING MOLTEN SLAG AND MOLTEN FERROMANGANESE, AND SEPARATING THE MOLTEN SLAG AND THE MOLTEN FERROMANGANESE, LIME AND SILICA BEING EMPLOYED IN THE CHARGE IN A MOLECULAR RATIO IN THE RANGE 0.8 TO 1.5 MOLECULES OF CAO TO 1.0 MOLECULE OF SIO2.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-23 | 1954-10-23 | 1955-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-23 | 1958-10-23 | 1959-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-23 | 1962-10-23 | 1963-04-24 | $7700.00 | Window Closed / Lapsed |