US2575238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of caustic soda cell liquor
Assignee: Dow Chemical Co
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Filing: 1948-08-02
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Granted: 1951-11-13
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Expires: 1968-08-02
Abstract
No abstract record available.
Inventors
- 👤 Vernon A Stenger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:08
CPC Classifications
C; C01; C01D; C01D1/00; C01D1/04; C01D1/28; C01D1/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
THE METHOD OF PRODUCING AN UNCLORED CONCENTRATED CAUSTIC SODA LIQUOR BY EVAPORATION OF WATER FROM CAUSTIC SODA DIAPHRAGM CELL EFFLUENT CONTAINING NOT OVER 25 PER CENT OF NAOH BY WEIGHT AND AN ALKALI METAL SULFATE IN A CONCENTRATION OF ABOUT 0.1 TO 0.4 PER CENT IN TERMS OF SO4, WHICH COMPRISES ADDING TO THE CELL EFFLUENT IN AQUEOUS SOLUTION A SOLUBLE BARIUM COMPOUND SELECTED FROM THE GROUP CONSISTING KOF BARIUM OXIDE, BARIUM HYDROXZIDE, AND BARIUM CHLORIDE, IN AMOUNT SUFFICIENT TO PRECIPITATE THE SULFATE AS BARIUM SULFATE AND PRODUCE A BARIUM ION CONCENTRATION OF 0.1 GRAM TO 0.4 GRAM PER 100 GRAMS OF EFFLUENT, SEPARATING THE RESULTING PRECIPITATE FROM THE SO-TREATED CELL EFFLUENT, AND CONCENTRATING THE SEPARATED CELL EFFLUENT BEYOND 25 PER CENT OF NAOH BY WEIGHT.
Claim 2
Independent Claim
126 words
THE METHOD OF PRODUCING AN UNCLORED CONCENTRATED CAUSTIC SODA LIQUOR BY EVAPORATION OF WATER FROM CAUSTIC SODA DIAPHRAGM CELL EFFLUENT CONTAINING NOT OVER 25 PER CENT OF NAOH BY WEIGHT AND AN ALKALI METAL SULFATE IN A CONCENTRATION OF ABOUT 0.1 TO 0.4 PER CENT IN TERMS OF SO4, WHICH COMPRISES ADDING TO THE CELL EFFLUENT IN AQUEOUS SOLUTION A SOLUBLE BARIUM COMPOUND SELECTED FROM THE GROUP CONSISTING KOF BARIUM OXIDE, BARIUM HYDROXZIDE, AND BARIUM CHLORIDE, IN AMOUNT SUFFICIENT TO PRECIPITATE THE SULFATE AS BARIUM SULFATE AND PRODUCE A BARIUM ION CONCENTRATION OF 0.1 GRAM TO 0.4 GRAM PER 100 GRAMS OF EFFLUENT, SEPARATING THE RESULTING PRECIPITATE FROM THE SO-TREATED CELL EFFLUENT, AND CONCENTRATING THE SEPARATED CELL EFFLUENT BEYOND 25 PER CENT OF NAOH BY WEIGHT.
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) | 1954-11-12 | 1955-05-14 | 1955-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-12 | 1959-05-14 | 1959-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-12 | 1963-05-14 | 1963-11-13 | $7700.00 | Window Closed / Lapsed |