Patent US3212879A successfully refreshed from Google Patents.
US3212879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for controlling shaft furnaces
Assignee: Institut de Recherches de la Siderurgie Francaise IRSID
•
Filing: 1962-10-15
•
Granted: 1965-10-19
•
Expires: 1982-10-15
Abstract
No abstract record available.
Inventors
- 👤 Cordier Jean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:36
CPC Classifications
C; C21; C21B; C21B5/00; C21B5/001; C21B5/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
IN A PROCESS FOR OPERATING A SHAFT FURNACE IN WHICH A HOT BLAST IS INTRODUCED THROUGH TUYERES AT A MEAN PRESSURE WITHIN THE RANGE OF A SET MINIMUM PRESSURE TO A SET MAXIMUM PRESSURE TOGETHER WITH FLUID FUEL, THE STEPS OF INCREASING THE RATE OF DELIVERY OF SAID FUEL AS THE PRESSURE OF THE BLAST INCREASES ABOVE SAID MEAN PRESSURE AND DECREASING THE RATE OF DELIVERY OF SAID FUEL WHEN THE PRESSURE OF THE BLAST DECREASES BELOW SAID MEAN PRESSURE, AND TERMINATING THE FLOW OF FUEL WHEN THE PRESSURE OF THE BLAST TRANSCENDS THE LIMITS OF SAID RANGE.
Claim 2
Dependent Claim
98 words
IN A PROCESS FOR OPERATING A SHAFT FURNACE IN WHICH A HOT BLAST IS INTRODUCED THROUGH TUYERES AT A MEAN PRESSURE WITHIN THE RANGE OF A SET MINIMUM PRESSURE TO A SET MAXIMUM PRESSURE TOGETHER WITH FLUID FUEL, THE STEPS OF INCREASING THE RATE OF DELIVERY OF SAID FUEL AS THE PRESSURE OF THE BLAST INCREASES ABOVE SAID MEAN PRESSURE AND DECREASING THE RATE OF DELIVERY OF SAID FUEL WHEN THE PRESSURE OF THE BLAST DECREASES BELOW SAID MEAN PRESSURE, AND TERMINATING THE FLOW OF FUEL WHEN THE PRESSURE OF THE BLAST TRANSCENDS THE LIMITS OF SAID RANGE.
References Cited (Backward Citations)
US1873996A
Cited
US2352312A
Cited
US2420398A
Cited
US2690333A
Cited
US2879056A
Cited
US2919185A
Cited
US3165339A
Cited
US3150962A
Cited
US3167421A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |