Patent US3835084A successfully refreshed from Google Patents.
US3835084A
Expired / Lapsed
US
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Poly-n-vinyl lactam-polyethyleneimine flocculating composition
Assignee: ISP Investments LLC
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Filing: 1972-03-30
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Granted: 1974-09-10
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Expires: 1992-03-30
Abstract
Abstract SOLIDS DISPERSED OR SUSPENDED IN AQUEOUS SYSTEMS ARE FLOCCULATED OR PRECIPITATED BY ADDING TO SAID SYSTEM A FLOCCULATING AMOUNT OF A BLEND, EITHER IN DRY FORM OR IN AN AQUEOUS SOLUTION, CONTAINING A POLYMERIC MIXTURE OF FROM 2 TO 4 PARTS BY WEIGHT OF A POLYVINYL LACTAM, E.G. POLYVINYL PYRROLIDONE, HAVING K-VALUE OF ABOUT 80 TO 140, AND 1 PART BY WEIGHT OF POLYETHYLENE IMINE HAVING A VISCOSITY OF ABOUT 20 TO 5,000 CENTIPOISES.
Inventors
- 👤 J Azorlosa
- 👤 E Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:26
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54
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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |