US3617561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for clarifying liquids
Assignee: BASF Catalysts LLC
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Filing: 1969-07-01
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Granted: 1971-11-02
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Expires: 1989-07-01
Abstract
Abstract An aqueous liquid containing suspended solids is clarified by a procedure in which attapulgite clay (preferably a concentrate of the attapulgite mineral content of such clay) is initially dispersed in the aqueous suspension. Before flocs form, there is incorporated an organic polymeric polyelectrolyte which interacts in situ with the deflocculated clay material to form flocs which occlude the matter that was originally suspended in the water. The clay material is preferably subjected to intensive mechanical work in the presence of water before it is added to the liquid to be clarified.
Inventors
- 👤 John R Fanselow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:59
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/5236; C02F1/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2981630A
Cited
US2795545A
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US3066095A
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US3142638A
Cited
US3342742A
Cited
US3511778A
Cited
US3477565A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |