US3661868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flocculant
Assignee: Dow Chemical Co
•
Filing: 1970-05-01
•
Granted: 1972-05-09
•
Expires: 1990-05-01
Abstract
Abstract IN THE INVERSE SUSPENSION POLYMERIZATION OF A MIXTURE OF ACRYLAMIDE AND AN N-(DIALKYLAMINOALKYL) ACRYLAMIDE OR METHACRYLAMIDE, THE RESULTING CATIONIC COPOLYMER HAS SUPERIOR FLOCCULATING CAPACITY WHEN THERE IS PRESENT IN THE MIXED MONOMERS A SMALL AMOUNT OF AN N-(DIALKYLAMINOALKYL) - 3 - (DIALKYLAMINOALKYLAMINO) PROPIONAMIDE. THIS ADDITIVE PREFERABLY CORRESPONDS IN ITS CARBON SKELETON AND NITROGEN ATOM SUBSTIUENTS TO THE CATIONIC MONOMER.
Inventors
- 👤 Benny G Barron
- 👤 Lake Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:58
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/52; C08F20/54; C08F20/56
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |