Patent US3220825A successfully refreshed from Google Patents.
US3220825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control for blast furnaces
Assignee: Elsag Bailey Inc
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Filing: 1961-06-01
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Granted: 1965-11-30
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Expires: 1981-06-01
Abstract
No abstract record available.
Inventors
- 👤 Ralph R Swain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:41
CPC Classifications
C; C21; C21B; C21B7/00; C21B7/24; C21B5/00; C21B5/001; C21B5/006
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
92 words
THE METHOD OF CONTROLLING A BLAST FURNACE HAVING AN ELONGATED VERTICAL STACK INTO THE TOP OF WHICH A BURDEN CONSISTING ESSENTIALLY OF LIMESTONE, A CARBONACEOUS MATERIAL AND A FERROUS BEARING MATERIAL IS CHARGED AND A LOWER HEARTH SECTION INTO WHICH A BLAST GAS AND AN INJECTION FUEL ARE DISCHARGED AND BURNED THE HOT GASES OF COMBUSTION PASSING UP THROUGH THE STACK FOR THE REDUCTION OF THE IRON ORE TO IRON WHICH INCLUDES REGULATING THE FLOW OF THE INJECTION FUEL IN ACCORDANCE WITH THE COMBUSTIBLES CONTENT IN THE TOP GAS LEAVING THE FURNACE.
Claim 2
Independent Claim
92 words
THE METHOD OF CONTROLLING A BLAST FURNACE HAVING AN ELONGATED VERTICAL STACK INTO THE TOP OF WHICH A BURDEN CONSISTING ESSENTIALLY OF LIMESTONE, A CARBONACEOUS MATERIAL AND A FERROUS BEARING MATERIAL IS CHARGED AND A LOWER HEARTH SECTION INTO WHICH A BLAST GAS AND AN INJECTION FUEL ARE DISCHARGED AND BURNED THE HOT GASES OF COMBUSTION PASSING UP THROUGH THE STACK FOR THE REDUCTION OF THE IRON ORE TO IRON WHICH INCLUDES REGULATING THE FLOW OF THE INJECTION FUEL IN ACCORDANCE WITH THE COMBUSTIBLES CONTENT IN THE TOP GAS LEAVING THE FURNACE.
Claim 3
Dependent Claim
95 words
IN A CONTROL SYSTEM FOR A BLAST FURNACE FOR THE REDUCTION OF IRON ORE TO IRON HAVING AN ELONGATED VERTICAL STACK INTO THE TOP OF WHICH A BURDEN CONSISTING OF CARBONACEOUS MATERIAL, LIMESTONE AND A FERROUS BEARING MATERIAL IS CHARGED AND A LOWER HEARTH SECTION INTO WHICH A BLAST GAS AND AN INJECTION FUEL ARE DISCHARGED AND BURNED, COMPRISING, IN COMBINATION, MEANS FOR ESTABLISHING A CONTROL SIGNAL CORRESPONDING TO THE COMBUSTIBLES CONTENT IN THE TOP GAS LEAVING THE FURNACE, AND MEANS FOR REGULATING THE FLOW OF INJECTION FUEL TO THE FURNACE RESPONSIVE TO SAID SIGNAL.
Claim 4
Dependent Claim
95 words
IN A CONTROL SYSTEM FOR A BLAST FURNACE FOR THE REDUCTION OF IRON ORE TO IRON HAVING AN ELONGATED VERTICAL STACK INTO THE TOP OF WHICH A BURDEN CONSISTING OF CARBONACEOUS MATERIAL, LIMESTONE AND A FERROUS BEARING MATERIAL IS CHARGED AND A LOWER HEARTH SECTION INTO WHICH A BLAST GAS AND AN INJECTION FUEL ARE DISCHARGED AND BURNED, COMPRISING, IN COMBINATION, MEANS FOR ESTABLISHING A CONTROL SIGNAL CORRESPONDING TO THE COMBUSTIBLES CONTENT IN THE TOP GAS LEAVING THE FURNACE, AND MEANS FOR REGULATING THE FLOW OF INJECTION FUEL TO THE FURNACE RESPONSIVE TO SAID SIGNAL.
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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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |