US3738945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyquaternary flocculants
Assignee: Individual
•
Filing: 1972-02-04
•
Granted: 1973-06-12
•
Expires: 1992-02-04
Abstract
Abstract POLYQUATERNARY FLOCCULANTS OF AVERAGE MOLECULAR WEIGHT, IN EXCESS OF 10,000 ARE PREPARED BY REACTING A SECONDARY AMINE WITH AN EPIHALOHYDRIN OR DIEPOXIDE FOR USE IN FLOCCULATION OF AQUEOUS SYSTEMS WHERE ORDINARY CATIONIC FLOCCULANTS CANNOT BE USED.
Inventors
- 👤 H Panzer
- 👤 K Dixon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:07
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/02; C08G73/0206; C08G73/0213; C08G73/0226; C02; C02F; C02F1/00; C02F1/52; C02F1/54; C08G59/00; C08G59/18; C08G59/40; C08G59/50
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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |