US2918365A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for controlling compositions of molten pig iron and slag in a blast furnace
Assignee: Yawata Seitetsu KK
•
Filing: 1954-08-09
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Granted: 1959-12-22
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Expires: 1974-08-09
Abstract
No abstract record available.
Inventors
- 👤 Kanamori Kuro
- 👤 Endo Katsujiro
- 👤 Kodama Koretaka
- 👤 Tokuhisa Masaaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:48
CPC Classifications
C; C21; C21B; C21B5/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
75 words
IN SMELTING PIG IRON IN A BLAST FURNACE, THE IMPROVEMENT IN ADJUSTING THE COMPOSITION OF A BATH OF MOLTEN MATERIAL IN SAID FURNACE COMPRISING: (1) PROVIDING A DOWNWARDLY INCLINED TUYERE ABOVE THE LEVEL OF THE MOLTEN MATERIAL AND (2) FEEDING A MATERIAL IN POWDERED FORM AND MIXED WITH GAS THROUGH SAID TUYERE DIRECTLY INTO THE BATH OF MOLTEN MATERIAL, SAID MATERIAL IN POWDERED FORM BEING ADDED TO THE MOLTEN MATERIAL FOR ADJUSTING THE COMPOSITION THEREOF.
References Cited (Backward Citations)
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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) | 1962-12-21 | 1963-06-22 | 1963-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-21 | 1967-06-22 | 1967-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-21 | 1971-06-22 | 1971-12-22 | $7700.00 | Window Closed / Lapsed |