Patent US3793174A successfully refreshed from Google Patents.
US3793174A
Expired / Lapsed
US
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Method of treating waste water containing ligninsulfonate
Assignee: Mitsui Kinzoku Co Ltd
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Filing: 1972-09-06
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Granted: 1974-02-19
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Expires: 1992-09-06
Abstract
Abstract A method of treating the waste water containing ligninsulfonate, wherein waste water contains sodium salt, calcium salt, potassium salt, etc. of ligninsulfonic acid, comprises the steps of: conducting electrolysis with a ferrous anode plate utilizing said waste water as an electrolyte which has been made to have pH within the range from 5 to 9 prior to the start of electrolysis, while air is being blown therein by a suitable means, whereby said ligninsulfonate is rendered insoluble; and subsequently separating said insoluble substances from the mother liquid by floating them.
Inventors
- 👤 M Ichiki
- 👤 M Ishii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:31
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/46; C02F1/461; C02F1/463; C02F1/24
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
28 words
A process of treating the waste water containing ligninsulfonate according to claim 1, wherein said ligninsulfonate is the sodium salt, potassium salt, or calcium salt oF ligninsulfonic acid.
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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |