US2863809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for concentration of caustic cell liquor
Assignee: Struthers Wells Corp
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Filing: 1956-04-05
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Granted: 1958-12-09
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Expires: 1976-04-05
Abstract
No abstract record available.
Inventors
- 👤 Svanoe Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:11
CPC Classifications
C; C01; C01D; C01D1/00; C01D1/04; C01D1/42
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
113 words
IN A PROCESS FOR THE SEPARATION OF SODIUM CHLORIDE AND SODIUM SULFATE FROM CAUSTIC CELL LIQUOR BRINE THE STEPS WHICH COMPRISE CONCENTRATING CAUSTIC CELL LIQUOR BRINE TO ABOUT 30% TO 35% NAOH BY WEIGHT, REMOVING THE CRYSTALLINE SODIUM CHLORIDE PRODUCED BY FILTRATION, CONCENTRATING FURTHER THE FILTERED LIQUOR TO ABOUT 55% NAOH BY WEIGHT WHEREBY THE SOLID PHASES WILL CONTAIN THE CRYSTALLINE SALTS, SODIUM CHLORIDE AND THE TRIPLE SALT, SODIUM HYDROXIDE-SODIUM CHLORIDE-SODIUM SULFATE, SEPARATING THE SALTS BY FILTRATION, DECOMPOSING THE TRIPLE SALT, BY SUSPENDING THE SEALTS IN A SODIUM HYDROXIDE SOLUTION OF LESS THAN 35% NAOH, AND SEPARATING BY THE DIFFERENCE IN BUOYANCY THE SODIUM CHLORIDE FROM THE SODIUM SULFATE CRYSTALS OF SAID DECOMPOSITION.
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) | 1961-12-08 | 1962-06-09 | 1962-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-08 | 1966-06-09 | 1966-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-08 | 1970-06-09 | 1970-12-09 | $7700.00 | Window Closed / Lapsed |