US3758289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prereduction process
Assignee: Ethyl Corp
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Filing: 1970-05-01
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Granted: 1973-09-11
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Expires: 1990-05-01
Abstract
Abstract ALUMINUM-SILICON ALLOY IS PRODUCED FROM ALUMINUMCONTAINING ORES IN A TWO-STEP PROCESS. THE FIRST STEP INCLUDES HEATING ALUMINUM-CONTAINING ORE TO A TEMPERATURE OF FROM ABOUT 1500*C. TO ABOUT 1800*C., THE HEAT BEING SUPPLIED BY A FOSSIL FUEL. THE SECOND STEP OF THE PROCESS INCLUDES TRANSFERRING THE PRODUCT OF THE FIRST STEP TO AN ELECTRIC ARC FURNACE AND HEATING THE PRODUCT TO A TEMPERATURE OF FROM ABOUT 2000 TO ABOUT 2300*C.
Inventors
- 👤 J Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:17
CPC Classifications
C; C22; C22C; C22C21/00; C22C21/02; C22B; C22B21/00; C22B21/02; C22C1/00; C22C1/02
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |