US3600308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of clarifying aqueous suspensions with polymerized lignin derivatives
Assignee: Weyerhaeuser Co
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Filing: 1969-09-12
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Granted: 1971-08-17
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Expires: 1989-09-12
Abstract
Abstract A FOREST-DERIVED MATERIAL FOR USE AS A COAGULANT AND THE METHOD OF USE OF THE COAGULANT IS DESCRIBED. LIGNIN AND LIGNO-SULFONATE MATERIALS ARE REACTED WITH VARIOUS CHEMI CAL AGENTS TO INCREASE THEIR MOLECULAR WEIGHT FOR USE AS COAGULANTS. THE METHOD OF USING HIGH MOLECULAR WEIGHT, FOREST-DERIVED PHENOLIC POLYMERS AS COAGULANTS AND CLARIFYING AGENTS IN AQUEOUS SYSTEMS IS DESCRIBED. THE NOVEL COAGULANTS MAY BE USED IN CONJUNCTION WITH TRADITIONALLY USED COAGULANTS TO INCREASE THE RATE OF COAGULATION.
Inventors
- 👤 George G Allan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:45
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/22
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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |