US2665244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refining aluminum electrolytically
Assignee: Pechiney SA
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Filing: 1950-06-12
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Granted: 1954-01-05
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Expires: 1970-06-12
Abstract
No abstract record available.
Inventors
- 👤 Menegoz Charles Daniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:51
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/06; C25C3/24
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
140 words
A METHOD FOR THE REFINING OF ALUMINUM ELECTROLYTICALLY BY FLOATING MOLTEN REFINED ALUMINUM FOR USE AS A CATHODE ON AN ELECTROLYTIC BATH WHICH IN TURN FLOATS ON A MOLTEN ALLOY OF UNREFINED ALUMINUM AND A HEAVY METAL FOR USE AS AN ANODE, SAID BATH COMPRISING FROM 37 TO 47 PER CENT BY WEIGHT OF BARIUM CHLORIDE, FROM 18 TO 28 PERCENT BY WEIGHT OF CALCIUM FLUORIDE, THE TOTAL AMOUNT OF THE THREE SALTS MAKING UP APPROXIMATELY 95 PER CENT BY WEIGHT OF THE BATH, FROM 25 TO 35 PER CENT BY WEIGHT OF ALUMINUM FLUORIDE, AND CONTAINING NO MORE THAN 1 PER CENT OF ALKALI METAL COMPOUNDS, SAID FLUORIDES AND CHLORIDES BEING SELECTED IN SUCH PROPORTION THAT THE BATH WILL FLOAT ON THE ANODIC LAYER BUT NOT FLOAT ON THE CATHODIC LAYER OF A REFINING APPARATUS OF THE TYPE DESCRIBED.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-04 | 1957-07-06 | 1958-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-04 | 1961-07-06 | 1962-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-04 | 1965-07-06 | 1966-01-05 | $7700.00 | Window Closed / Lapsed |