US3721546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for production of aluminum
Assignee: Resonac Holdings Corp
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Filing: 1970-08-11
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Granted: 1973-03-20
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Expires: 1990-08-11
Abstract
Abstract A METHOD FOR THE PRODUCTION OF ALUMINUM OF HIGH PURITY WHICH CONSISTS EXCLUSIVELY OF THE STEPS OF REDUCING ALUMINA WITH CARBON IN AN ARC FURNACE, THEREBY OBTAINING AN ALUMINUM-CONTAINING COMPOSITION, THEN MAINTAINING THE ALUMINUM-CONTAINING COMPOSITION AT A TEMPERATURE WITHIN THE RANGE OF 1400*C. TO 2000*C. ON A FILTER IN A VESSEL, WHEREBY THE ALUMINUM IS EXTRACTED ALONE AND SEPARATED FROM THE COMPOSITION THROUGH THE FILTER.
Inventors
- 👤 I Ono
- 👤 M Takahashi
- 👤 K Goto
- 👤 T Shiba
- 👤 J Tsuruki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:14
CPC Classifications
C; C22; C22B; C22B21/00; C22B21/06; C22B21/066; C22B21/02
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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |