US2994602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of vacuum degasifying molten steel by circulation
Assignee: Yawata Iron and Steel Co Ltd
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Filing: 1959-09-30
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Granted: 1961-08-01
•
Expires: 1979-09-30
Abstract
No abstract record available.
Inventors
- 👤 Matsuda Kamematsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:30
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
A METHOD OF DEGASIFYING MOLTEN STEEL COMPRISING PROVIDING A VACUUM VESSEL ABOVE AN OPEN LADLE OF THE MOLTEN STEEL TO BE GASIFIED, SAID VACUUM VESSEL HAVING A CENTRAL PIPE DEPENDING FROM THE CENTER OF THE BOTTOM THEREOF INTO THE LADLE AND HAVING AT LEAST ONE DISCHARGE PIPE DEPENDING FROM THE PERIPHERY OF THE BOTTOM THEREOF INTO THE LADLE, APPLYING A VACUUM TO THE VACUUM VESSEL AND DRAWING THE MOLTEN STEEL UP INTO THE VESSEL THROUGH THE PIPES, AND WHILE MAINTAINING THE VACUUM, CAUSING THE MOLTEN STEEL IN THE VESSEL TO ROTATE AROUND A SUBSTANTIALLY VERTICAL AXIS, WHEREBY THE SURFACE OF THE MOLTEN STEEL ASSUMES A PARABOLIC SHAPE DUE TO THE CENTRIFUGAL FORCES PRODUCED DURING ROTATION, AND A DIFFERENCE A STATIC HEAD IS PRODUCED BETWEEN THE CENTRAL PIPE AND THE DISCHARGE PIPE CAUSING THE DEGASIFIED MOLTEN STEEL TO FLOW OUT OF THE VESSEL BACK INTO THE LADLE THROUGH THE DISCHARGE PIPE AND THE MOLTEN STEEL FROM THE LADLE TO FLOW UPWARDLY INTO THE VESSEL THROUGH THE CENTRAL PIPE.
Claim 2
Independent Claim
167 words
A METHOD OF DEGASIFYING MOLTEN STEEL COMPRISING PROVIDING A VACUUM VESSEL ABOVE AN OPEN LADLE OF THE MOLTEN STEEL TO BE GASIFIED, SAID VACUUM VESSEL HAVING A CENTRAL PIPE DEPENDING FROM THE CENTER OF THE BOTTOM THEREOF INTO THE LADLE AND HAVING AT LEAST ONE DISCHARGE PIPE DEPENDING FROM THE PERIPHERY OF THE BOTTOM THEREOF INTO THE LADLE, APPLYING A VACUUM TO THE VACUUM VESSEL AND DRAWING THE MOLTEN STEEL UP INTO THE VESSEL THROUGH THE PIPES, AND WHILE MAINTAINING THE VACUUM, CAUSING THE MOLTEN STEEL IN THE VESSEL TO ROTATE AROUND A SUBSTANTIALLY VERTICAL AXIS, WHEREBY THE SURFACE OF THE MOLTEN STEEL ASSUMES A PARABOLIC SHAPE DUE TO THE CENTRIFUGAL FORCES PRODUCED DURING ROTATION, AND A DIFFERENCE A STATIC HEAD IS PRODUCED BETWEEN THE CENTRAL PIPE AND THE DISCHARGE PIPE CAUSING THE DEGASIFIED MOLTEN STEEL TO FLOW OUT OF THE VESSEL BACK INTO THE LADLE THROUGH THE DISCHARGE PIPE AND THE MOLTEN STEEL FROM THE LADLE TO FLOW UPWARDLY INTO THE VESSEL THROUGH THE CENTRAL PIPE.
References Cited (Backward Citations)
US2397737A
Cited
US2893860A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-31 | 1965-01-30 | 1965-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-31 | 1969-01-30 | 1969-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-31 | 1973-01-30 | 1973-08-01 | $7700.00 | Window Closed / Lapsed |