US3567429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing a strontium and/or barium alloy
Assignee: GEA Group AG
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Filing: 1968-09-09
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Granted: 1971-03-02
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Expires: 1988-09-09
Abstract
Abstract STRONTIUM AND/OR BARIUM ARE CHARGED INTO A SILICON MELT HAVING A TEMPERATURE OF FROM 650 TO 1700*C. AND CONTAINING FROM 0.5% TO 70% OF MAGNESIUM, CALCIUM, OR ALUMINUM, AND A FLUX. THE MELT IS STIRRED VIGOROUSLY. SUBSTANTIALLY ALL OF THE STRONTIUM AND/OR BARIUM IS ALLOYED. THE ALLOY IS THEN USED TO REFINE ALUMINUM.
Inventors
- 👤 Eckhard Dunkel
- 👤 Wolfgang Thiele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:51
CPC Classifications
C; C22; C22C; C22C21/00; C22C21/02; C22C21/04; C22C1/00; C22C1/02; C22C1/03
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) | 1974-03-01 | 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 |