US2689791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovering sodium from sludge
Assignee: Ethyl Corp
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Filing: 1951-10-30
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Granted: 1954-09-21
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Expires: 1971-10-30
Abstract
No abstract record available.
Inventors
- 👤 James C Boag
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:55
CPC Classifications
C; C22; C22B; C22B26/00; C22B26/10; C22C; C22C3/00; C22C3/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A PROCESS FOR RECOVERING SODIUM FROM THE SLUDGE OBTAINED AS A BY-PRODUCT IN THE MANUFACTURE OF ALKALI METAL BY THE ELECTROLYSIS OF FUSED SALT MIXTURES AND CONTAINING CALCIUM CRYSTALS THE MAJOR DIAMETERS OF WHICH VARY IN SIZE, COMPRISING HEATING SAID SLUDGE TO A TEMPERATURE BETWEEN 110 AND 130* C., FILTERING SAID MIXTURE AT SAID TEMPERATURE THROUGH A FILTER MEDIUM ACROSS WHICH IS MAINTAINED A PRESSURE DIFFERENTIAL NO GREATER THAN 20 POUNDS PER SQUARE INCH, SAID FILTER MEDIUM HAVING OPENINGS WHICH ARE AT LEAST 5 TIMES LARGER THAN THE MAJOR DIAMETER OF THE SMALLEST OF SAID CRYSTALS BUT SMALLER THAN THE MAJOR DIAMETER OF THE LARGEST OF SAID CRYSTALS, AND COLLECTING THE FILTRATE THEREBY OBTAINED.
Claim 2
Dependent Claim
114 words
A PROCESS FOR RECOVERING SODIUM FROM THE SLUDGE OBTAINED AS A BY-PRODUCT IN THE MANUFACTURE OF ALKALI METAL BY THE ELECTROLYSIS OF FUSED SALT MIXTURES AND CONTAINING CALCIUM CRYSTALS THE MAJOR DIAMETERS OF WHICH VARY IN SIZE, COMPRISING HEATING SAID SLUDGE TO A TEMPERATURE BETWEEN 110 AND 130* C., FILTERING SAID MIXTURE AT SAID TEMPERATURE THROUGH A FILTER MEDIUM ACROSS WHICH IS MAINTAINED A PRESSURE DIFFERENTIAL NO GREATER THAN 20 POUNDS PER SQUARE INCH, SAID FILTER MEDIUM HAVING OPENINGS WHICH ARE AT LEAST 5 TIMES LARGER THAN THE MAJOR DIAMETER OF THE SMALLEST OF SAID CRYSTALS BUT SMALLER THAN THE MAJOR DIAMETER OF THE LARGEST OF SAID CRYSTALS, AND COLLECTING THE FILTRATE THEREBY OBTAINED.
References Cited (Backward Citations)
US2124564A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-20 | 1958-03-22 | 1958-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-20 | 1962-03-22 | 1962-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-20 | 1966-03-22 | 1966-09-21 | $7700.00 | Window Closed / Lapsed |