US3737305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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 THIS IS A IMPROVEMENT IN A MOLTEN ALUMINUM REFINING PROCESS OF THE TYPE DESCRIBED IN U.S. PAT.3,039,864 WHERE A NON-REACTIVE FLUXING GAS IS PASSED THROUGH MOLTEN ALUMINUM AS IT MOVES THROUGH A BED OF REFRACTORY BODIES TO REMOVE FROM THE ALUMINUM HYDROGEN GAS AN NON-METALLIC IMPURITIES SUCH AS OXIDES. ACCORDING TO THE IMPROVEMENT A RELATIVELY SMALL STREAM OF A REACTIVE CHLORINACEOUS FLUXING GAS INTRODUCED ALONG WITH THE NON-REACTIVE FLUXING GAS SUBSTANTIALLY INCREASES THE USEFUL LIFE OF THE REFRACTORY BODY BED. THE PROCESS IS CAPABLE OF CHLORINE FUME-FREE OPERATION. D R A W I N G
Inventors
- 👤 L Blayden
- 👤 K Brondyke
- 👤 R Spear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:55
CPC Classifications
C; C22; C22B; C22B9/00; C22B9/05; C22B9/055; 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 |