US3575695A
Expired / Lapsed
US
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Deoxidation method of molten steel
Assignee: JFE Engineering Corp
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Filing: 1968-10-10
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Granted: 1971-04-20
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Expires: 1988-10-10
Abstract
Abstract METHOD OF DEOXIDIZING MOLTEN STEEL BY ADDING CALCIUM OR CALCIUM ALLOY TO THE LOWER PART OF THE MOLTEN STEEL IN A VESSEL AFTER OR DURING DEOXIDATION. BY INCREASING THE YIELD OF CALCIUM IN THE MOLTEN STEEL, FLOATATION OF SOME INCLUSIONS ARE RAPIDLY ACCELERATED AND THEN THOSE ARE EASILY SEPARATED, AND THE PRESENCE OF HARMFUL MACRO INCLUSIONS MAY BE DECREASED IN A GREAT QUANTITY.
Inventors
- 👤 Yoshio Miyashita
- 👤 Katuhiko Nishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:31
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/04; C21C7/06
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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |