US3323904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of operating a blast furnace
Assignee: Yawata Iron and Steel Co Ltd
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Filing: 1963-10-07
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Granted: 1967-06-06
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Expires: 1983-10-07
Abstract
No abstract record available.
Inventors
- 👤 Kodama Koretaka
- 👤 Shigemi Akitoshi
- 👤 Ogata Toshimitsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:42
CPC Classifications
C; C21; C21B; C21B5/00; C21B5/02; C21B5/023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A METHOD OF OPERATING A BLAST FURNACE FOR PRODUCING PIG IRON IN A BLAST FURNACE COMPRISING CHARGING THE FURNAME WITH A CHARGE HAVING AT LEAST 30% HIGH TITANIFERROUS CONTENT IRON SAND ORES, BLOWING AT LEAST ONE POWDERY SOLID OXIDIZING AGENT SELECTED FROM THE GROUP CONSISTING OF POWDERED IRON ORE, CONVERTER SLUDGE, OPEN-HEARTH SLUDGE AND POWDERED MANGANESE ORE WITH A HIGH PRESSURE GASEOUS MEDIUM INTO THE FURNACE AT A POINT IN THE ZONE CONSTITUTED BY THE BOSH AND HEARTH ABOVE ANY POOL OF MOLTEN METAL AND SLAG WHICH IS PRESENT THEREIN.
Claim 2
Independent Claim
90 words
A METHOD OF OPERATING A BLAST FURNACE FOR PRODUCING PIG IRON IN A BLAST FURNACE COMPRISING CHARGING THE FURNAME WITH A CHARGE HAVING AT LEAST 30% HIGH TITANIFERROUS CONTENT IRON SAND ORES, BLOWING AT LEAST ONE POWDERY SOLID OXIDIZING AGENT SELECTED FROM THE GROUP CONSISTING OF POWDERED IRON ORE, CONVERTER SLUDGE, OPEN-HEARTH SLUDGE AND POWDERED MANGANESE ORE WITH A HIGH PRESSURE GASEOUS MEDIUM INTO THE FURNACE AT A POINT IN THE ZONE CONSTITUTED BY THE BOSH AND HEARTH ABOVE ANY POOL OF MOLTEN METAL AND SLAG WHICH IS PRESENT THEREIN.
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) | 1970-06-05 | 1970-12-05 | 1971-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-05 | 1974-12-05 | 1975-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-05 | 1978-12-05 | 1979-06-06 | $7700.00 | Window Closed / Lapsed |