Patent US2661278A successfully refreshed from Google Patents.
US2661278A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing pig iron
Assignee: Individual
•
Filing: 1951-06-05
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Granted: 1953-12-01
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Expires: 1971-06-05
Abstract
No abstract record available.
Inventors
- 👤 Edwin Emil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:50
CPC Classifications
C; C21; C21B; C21B5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
IN A METHOD OF PRODUCING PIG IRON IN A BLAST FURNACE WHICH INCLUDES CHARGING INTO THE FURNACE, A MIXTURE OF IRON ORE AND COKE THE IMPROVEMENT WHICH COMPRISES BLOWING INTO THE MELTING ZONE OF THE FURNACE AN OXIDIZING BLAST WHICH CONSISTS ESSENTIALLY OF FREE OXYGEN AND FREE NITROGEN AND IS PREHEATED TO A MINIMUM TEMPERATURE OF
Claim 2
Dependent Claim
56 words
IN A METHOD OF PRODUCING PIG IRON IN A BLAST FURNACE WHICH INCLUDES CHARGING INTO THE FURNACE, A MIXTURE OF IRON ORE AND COKE THE IMPROVEMENT WHICH COMPRISES BLOWING INTO THE MELTING ZONE OF THE FURNACE AN OXIDIZING BLAST WHICH CONSISTS ESSENTIALLY OF FREE OXYGEN AND FREE NITROGEN AND IS PREHEATED TO A MINIMUM TEMPERATURE OF
References Cited (Backward Citations)
US2559213A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-30 | 1957-06-01 | 1957-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-30 | 1961-06-01 | 1961-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-30 | 1965-06-01 | 1965-12-01 | $7700.00 | Window Closed / Lapsed |