US3706629A
Expired / Lapsed
US
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Drainage improvement in paper pulp suspensions containing lignin residues
Assignee: Dow Chemical Co
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Filing: 1970-07-23
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Granted: 1972-12-19
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Expires: 1990-07-23
Abstract
Abstract DRAINAGE IS IMPROVED IN A CELLULOSIC PULP SUSPENSION CONTAINING SOLUBLE LIGNIN RESIDUES BY THE ADDITION TO THE SUSPENSION OF A HIGH MOLECULAR WEIGHT WATER-SOLUBLE ANIONIC POLYMERIC AND ALUM IN A QUANTITY GREATER THAN THAT NORMALLY USED.
Inventors
- 👤 Edgar E Moore
- 👤 William A Foster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:24
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/42; D21H17/43
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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |