Patent US3829378A successfully refreshed from Google Patents.
US3829378A
Expired / Lapsed
US
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Purification of waste water from styrene bead polymer production
Assignee: BASF SE
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Filing: 1972-10-02
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Granted: 1974-08-13
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Expires: 1992-10-02
Abstract
Abstract PROCESS FOR PURIFYING WASTE WATER OBTAINED IN THE PRODUCTION OF STYRENE BEAD POLYMERS IN THE PRESENCE OF VINYL PYRROLIDONE POLYMERS OR VINYL ALCOHOL POLYMERS USED AS SUSPENSION STABILIZERS, WHICH PROCESS COMPRISES TREATING SAID WASTE WATER AT 70-180*C. WITH 0.02 TO 5% BY WEIGHT OF THE PERSULFATE OF SODIUM, POTASIUM OR AMMONIUM IN ORDER TO FLOCCULATE THE SUSPENDED MATTER.
Inventors
- 👤 H Keppler
- 👤 L Zuern
- 👤 E Stahnecker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:18
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/722; C02F1/52; C02F1/5236; C02F2103/00; C02F2103/34; C02F2103/36; C02F2103/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |