US3764299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of operating a blast furnace by varying gaseous feed rates
Assignee: JFE Engineering Corp
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Filing: 1971-05-26
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Granted: 1973-10-09
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Expires: 1991-05-26
Abstract
Abstract A METHOD OF OPERATING A BLAST-FURNACE COMPRISING BLOWING INTO THE FURNACE A GASEOUS AUXILIARY REDUCING MEDIUM, SUCH AS REDUCING GAS, AT A LEVEL ABOVE THE BLAST TUYERES AND SUBSTANTIALLY ABOVE THE ZONE IN WHICH THE BURDEN MELTS DOWN, WHILE SIMULTANEOUSLY BLOWING IN BLAST AIR THROUGH THE BLAST TUYERES, WHEREIN THE FEED RATE OF SAID REDUCTION MEDIUM AND THE FEED RATE OF SAID BLAST AIR ARE BOTH PERIODICALLY VARIED, EACH BETWEEN A MAXIMUM AND A MINIMUM VALUE, SAID FEED RATES BEING MATCHED, ONE TO THE OTHER, TO PROVIDE A SUBSTANTIALLY CONSTANT RATE OF PRODUCTION OF TOP GASES AND TO GIVE AN OPTIMUM GAS VELOCITY AT THE TOP OF THE FURNACE.
Inventors
- 👤 W Wenzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:08
CPC Classifications
C; C21; C21B; C21B5/00; C21B5/06; B; B65; B65G; B65G47/00; B65G47/34; B65G47/46; B65G47/50; G; G05; G05B; G05B19/00; G05B19/02; G05B19/04; G05B19/07; C21B2100/00; C21B2100/40; C21B2100/44; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/122; Y02P10/143; Y02P10/25
Claims Analysis
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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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |