US3737304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating molten aluminum
Assignee: Alcoa Corp
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Filing: 1970-12-02
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Granted: 1973-06-05
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Expires: 1990-12-02
Abstract
Abstract THE SODIUM OXIDE AND HYDROGEN CONTENT OF MOLTEN ALUMINUM IS DRASTICALLY REDUCED BY MOVNG THE MOLTEN ALUMINUM THROUGH TWO PURIFYING ZONES. IN EACH ZONE THE MOLTEN ALUMINUM IS MOVED THROUGH A BED OF REFRACTORY BODIES IN CONTACT WITH FLUXING GASES. CONDITIONS ARE CAREFULLY MAINTAINED TO REMOVE IMPURITIES WHILE PREVENTING DETERIORATION OF THE BEDS. THE PROCESS CAN BE OPERATED ON A POLLUTION FREE BASIS AND YET ACHIEVE EXTREMELY LOW IMPURITY LEVELS.
Inventors
- 👤 L Blayden
- 👤 K Brondyke
- 👤 R Spear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:42
CPC Classifications
C; C22; C22B; C22B21/00; C22B21/06; C22B21/066
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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |