US2714053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the recovery of cryolite from the carbon bottoms of fusion electrolysis cells
Assignee: Vereinigte Aluminium Werke AG
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Filing: 1953-11-23
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Granted: 1955-07-26
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Expires: 1973-11-23
Abstract
No abstract record available.
Inventors
- 👤 Albert Otto
- 👤 Mader Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:13
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/48; C01F7/50; C01F7/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
IN A PROCESS FOR RECOVERING CRYOLITE FROM THE CARBON BOTTOMS OF FUSION ELECTROLYSIS CELLS BY THE GROUND BOTTOM CARBON WITH AQUEOUS ALKALI METAL HYDROXIDE SOLUTION, FILTERING OFF THE INSOLUBLE MATTER FROM THE LIQUID, AND PRECIPITATING THE CRYOLITE FROM THE LIQUID BY INTRODUCTION OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF CARBON DIOXIDE AND ALKALI METAL BICARBONATE, THE STEPS OF ADDING FLUORINE IONS TO THE LIQUID PRIOR TO THE PRECIPITATION STEP IN AN EXCESS OF AT LEAST 30% BY WEIGHT BEYOND THAT WHICH CORRESPONDS TO THE STOICHIOMETRIC RATIO BETWEEN ALUMINUM AND FLUORINE IN CRYOLITE.
Claim 2
Dependent Claim
94 words
IN A PROCESS FOR RECOVERING CRYOLITE FROM THE CARBON BOTTOMS OF FUSION ELECTROLYSIS CELLS BY THE GROUND BOTTOM CARBON WITH AQUEOUS ALKALI METAL HYDROXIDE SOLUTION, FILTERING OFF THE INSOLUBLE MATTER FROM THE LIQUID, AND PRECIPITATING THE CRYOLITE FROM THE LIQUID BY INTRODUCTION OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF CARBON DIOXIDE AND ALKALI METAL BICARBONATE, THE STEPS OF ADDING FLUORINE IONS TO THE LIQUID PRIOR TO THE PRECIPITATION STEP IN AN EXCESS OF AT LEAST 30% BY WEIGHT BEYOND THAT WHICH CORRESPONDS TO THE STOICHIOMETRIC RATIO BETWEEN ALUMINUM AND FLUORINE IN CRYOLITE.
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) | 1958-07-25 | 1959-01-24 | 1959-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-07-25 | 1963-01-24 | 1963-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-07-25 | 1967-01-24 | 1967-07-26 | $7700.00 | Window Closed / Lapsed |