US3560197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of blast furnace control
Assignee: Jones and Laughlin Steel Corp
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Filing: 1968-03-20
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Granted: 1971-02-02
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Expires: 1988-03-20
Abstract
Abstract THE OPERATION OF A BLAST FURNACE IS CONTROLLED BY CHANGING THE MOISTURE LEVEL OF THE HOT BLAST IN RESPONSE TO VARIATIONS IN THE PEAK HOT TEMPERATURE FROM CAST TO CAST WITH RELATION TO AN AIM PEAK HOT METAL TEMPERATURE. BURDEN RATIO CHANGES ARE MADE AS THE HOT BLAST MOISTURE LEVEL REACHES PREDETERMINED MAXIMUM AND MINIMUM VALUES ALONG WITH EQUIVALENT MOISTURE CHANGES IN ORDER TO MAINTAIN THE MOISTURE LEVEL WITHIN A PREDETERMINED RANGE WITHOUT AFFECTING THE HOT METAL TEMPERATURE.
Inventors
- 👤 Donald J Shellenberger
- 👤 Thomas A Powell Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:54
CPC Classifications
C; C21; C21B; C21B5/00
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |