US3702694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for judging the conditions of blast furnace
Assignee: Nippon Steel Corp
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Filing: 1971-05-12
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Granted: 1972-11-14
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Expires: 1991-05-12
Abstract
Abstract AMONG THE SOLID BORNE SOUNDS GENERATED BY THE MANTLE OF THE BLAST FURNACE IN OPERATION, THE MAGNITUDE OF THE LEVEL OF THE SOLID BORNE SOUNDS WITHIN THE SPECIFIC FREQUENCY BAND IS CORRELATED WITH THE CONDITIONS OF THE BLAST FURNACE, FOR EXAMPLE, SLIPPIN, HANGING OR FALLING OF THE HANGING. A DETECTOR DETECTS SOLID BORNE SOUNDS FROM THE MANTLE OF THE BLAST FURNACE, A BAND PASS FILTER CIRCUIT SELECTS THE SOLID BORNE SOUNDS WITHIN THE SPECIFIC FREQUENCY BAND, AND AN INTEGRATION CIRCUIT PRODUCES SIGNALS EXPRESSING THE MEAN INTENSITY LEVEL OF THE SELECTED SOLID BORNE SOUNDS. THROUGH THE SIGNALS THE CONDITION OF THE BLAST FURNACE IS JUDGED.
Inventors
- 👤 Naoteru Oda
- 👤 Seiichi Nishimura
- 👤 Hideo Komatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:42
CPC Classifications
C; C21; C21B; C21B5/00; C21B5/006; C21B7/00; C21B7/24; G; G01; G01F; G01F23/00; G01F23/22; G01F23/28; G01F23/296; G01N; G01N2291/00; G01N2291/02; G01N2291/028; G01N2291/02836
Claims Analysis
Total Claims: 0
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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) | 1975-11-14 | 1976-05-15 | 1976-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-14 | 1980-05-15 | 1980-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-14 | 1984-05-15 | 1984-11-14 | $7700.00 | Window Closed / Lapsed |