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Patent US3574603A successfully refreshed from Google Patents.
US3574603A
Expired / Lapsed
US
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Method for producing stainless steel
Assignee: Amsted Industries Inc
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Filing: 1967-09-15
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Granted: 1971-04-13
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Expires: 1987-09-15
Abstract
Abstract IN THE PRODUCTION OF STAINLESS STEELS INVOLVING ADDITIONS OF TITANIUM, COLUMBIUM OR TANTALUM, THE MOLTEN STEEL IS AGITATED IN THE LADLE BY THE INTRODUCTION OF AN INERT GAS FROM A LOWER PORTION OF THE SIDE OF THE LADLE, WHILE MAINTAINING A LAYER OF SLAG ON THE MELT. THE MELT IS CAST INTO A SLAB OR OTHER SUITABLE FORM BY PRESSURE POURING, WHICH INVOLVES DISPOSING THE LADLE IN AN ENCLOSURE WITH A POURING TUBE BETWEEN A MOLD AND A LOWER PORTION OF THE MELT, AND APPLYING SUPERATMOSPHERIC PRESSURE WITHIN THE ENCLOSURE. PREFERABLY, AN INERT GAS ATMOSPHERE IS MAINTAINED IN THE CASTING CAVITY OF THE MOLD DURING THE POURING OPERATION.
Inventors
- 👤 John A Rassenfoss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:26
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/0037; C22; C22C; C22C38/00; C22C38/18; C22C38/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |