US3567431A
Expired / Lapsed
US
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Production of magnesium in slag of restricted cao content
Assignee: Reynolds Metals Co
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Filing: 1967-07-05
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Granted: 1971-03-02
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Expires: 1987-07-05
Abstract
Abstract MAGNESIUM OXIDE AND CALCIUM OXIDE, IN RESPECTIVE MOLAR PROPORTIONS VARYING FROM 4:1 TO 8:1, ARE FED INTO AN ELECTRIC FURNACE INTO WHICH A METALLIC SILICON-CONTAINING REDUCTANT, HAVING APPROXIMATELY EQUAL CONTENTS BY WEIGHT OF SI AND AL AND ALSO CONTAINING IRON AND TITANIUM, IS FED IS MATCHED PROPORTION TO THE CAO IN ORDER TO MAINTAIN A LIQUID SLAG BATH HAVING CAO AND SIO2 IN RESPECTIVE MOLAR RATIOS VARYING FROM ABOUT 0:5:1.0 TO ABOUT 1.2:1.0, WHEREBY THE WEIGHT OF SLAG WHICH IS PRODUCED IS APPROXIMATELY TWICE THE WEIGHT OF MAGNESIUM METAL PRODUCT.
Inventors
- 👤 Walther Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:52
CPC Classifications
C; C22; C22B; C22B26/00; C22B26/20; C22B26/22
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |