US3236629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of introducing fluid fuel into a blast furnace
Assignee: United States Steel Corp
•
Filing: 1962-12-19
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Granted: 1966-02-22
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Expires: 1982-12-19
Abstract
No abstract record available.
Inventors
- 👤 Jagdish C Agarwal
- 👤 Charles M Sciulli
- 👤 Robert L Stephenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:30
CPC Classifications
C; C21; C21B; C21B7/00; C21B7/16; C21B5/00; C21B5/001
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
THE METHOD OF OPERATING A BLAST FURNACE CONTAINING MOLTEN METAL AND COKE, SAID BLAST FURNACE HAVING A PLURALITY OF TUYERES EACH CONNECTED TO A MANIFOLD THROUGH A BLOWPIPE, WHICH METHOD COMPRISES INTRODUCING AIR INTO EACH TUYERE, INSERTING AN INJECTION TUBE THROUGH EACH OF SAID BLOWPIPES INTO THE ASSOCIATED TUYERE UNTIL THE DISCHARGE END OF THE INJECTION TUBE IS AT A DISTANCE FROM THE DISCHARGE END OF THE TUYERE EQUAL TO BETWEEN 1/3 AND 1 1/3 TIMES THE INTERNAL DIAMETER OF THE NOSE OF THE TUYERE, AND INTRODUCING FLUID FUEL SUBSTANTIALLY FREE OF COMBUSTION AIR INTO SAID INJECTION TUBES, THE AMOUNT OF AIR IN THE FUEL NOT EXCEEDING 5% OF THE AIR NECESSARY FOR COMBUSTION.
Claim 2
Independent Claim
114 words
THE METHOD OF OPERATING A BLAST FURNACE CONTAINING MOLTEN METAL AND COKE, SAID BLAST FURNACE HAVING A PLURALITY OF TUYERES EACH CONNECTED TO A MANIFOLD THROUGH A BLOWPIPE, WHICH METHOD COMPRISES INTRODUCING AIR INTO EACH TUYERE, INSERTING AN INJECTION TUBE THROUGH EACH OF SAID BLOWPIPES INTO THE ASSOCIATED TUYERE UNTIL THE DISCHARGE END OF THE INJECTION TUBE IS AT A DISTANCE FROM THE DISCHARGE END OF THE TUYERE EQUAL TO BETWEEN 1/3 AND 1 1/3 TIMES THE INTERNAL DIAMETER OF THE NOSE OF THE TUYERE, AND INTRODUCING FLUID FUEL SUBSTANTIALLY FREE OF COMBUSTION AIR INTO SAID INJECTION TUBES, THE AMOUNT OF AIR IN THE FUEL NOT EXCEEDING 5% OF THE AIR NECESSARY FOR COMBUSTION.
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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) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |