US3617568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for flocculating colloidal particles by the sequential addition of polymers
Assignee: Standard Oil Co
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Filing: 1970-01-02
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Granted: 1971-11-02
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Expires: 1990-01-02
Abstract
Abstract The removal of colloidal particles from a colloidal system is enhanced by sequential addition of two polymeric flocculants in controlled amounts. The first has a polymeric ion form whose charge is opposite that of the colloidal particles and the second has a polymeric ion form whose charge is opposite that of the first polymeric ion. This process is particularly effective in aqueous systems and forms large, strongly bonded flocs of low density which may be readily removed by steps such as filtration or flotation.
Inventors
- 👤 Herman E Ries Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:13
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3377274A
Cited
US3542674A
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 |