Patent US1966945A successfully refreshed from Google Patents.
Patent US3677940A successfully refreshed from Google Patents.
US3677940A
Expired / Lapsed
US
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Method of treating scouring and dyeing waste water
Assignee: Kurita Water Industries Ltd
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Filing: 1971-02-16
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Granted: 1972-07-18
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Expires: 1991-02-16
Abstract
Abstract A METHOD OF TREATING A WOOL SCOURING WASTE WATER AND A DYEING WASTE WATER WHICH COMPRISES THE STEPS: MIXING THE SCOURING WASTE WATER AND DYEING WASTE WATER; ADDING TO THE MIXED LIQUID THUS PREPARED A COAGULANT CONSISTING OF AN INORGANIC METALLIC SALT AND ADJUSTING THE PH TO THEREBY GIVE RISE TO FLOCS OF METALLIC HYDROXIDE; FURTHER ADDING AN ANIONIC ORGANIC COAGULANT TO THEREBY GIVE RISE TO AGGREGATION OF SAID FLOCS; AND SEPARATING THE RESULTING SLUDGE.
Inventors
- 👤 Hiroshi Fujimoto
- 👤 Mitsugu Fukuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:17
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; C02F1/24; C02F1/5236; C02F9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |