US3761406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flocculation and demulsification using cationic polyvinyl alcohols
Assignee: WR Grace and Co Conn
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Filing: 1971-01-08
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Granted: 1973-09-25
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Expires: 1991-01-08
Abstract
Abstract CATIONIC POLYVINYL ALCOHOL POLYMERS OF THE CLASS N,NDIALKYLETHYLAMINO POLYVINYL ALCOHOL ARE USEFUL FLUOCCULANTS FOR CLAYS AND DEMULSIFIERS FOR OIL-WATER EMULSIONS. CELLULOSE MAY ALSO BE FLOCCULATED BY THE ADDITION OF THESE POLYMERS ALONG WITH A BORATE AND ADJUSTING THE PH TO GREATER THAN 7.
Inventors
- 👤 A Tsuk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:34
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/66; D21F1/82; B; B01; B01D; B01D17/00; B01D17/02; B01D17/04; B01D17/047; B01D21/00; B01D21/01; C; C02; C02F; C02F1/00; C02F1/52; C02F1/5236; C02F1/54; Y; Y10; Y10S; Y10S210/00; Y10S210/928
Claims Analysis
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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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |