US3692673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-soluble sulfonate polymers as flocculants
Assignee: Lubrizol Corp
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Filing: 1971-02-12
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Granted: 1972-09-19
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Expires: 1991-02-12
Abstract
Abstract POLYMERS OF ACRYLAMIDO SULFONIC ACIDS AND THEIR SALTS, ESPECIALLY 2-ACRYLAMIDO-2-METHYLPROPANESULFONIC ACID AND ITS SALTS, ARE USEFUL AS FLOCCULANTS FOR AQUEOUS SYSTEMS, ESPECIALLY IN COMBINATION WITH INORGANIC CO-FLOCCULANTS.
Inventors
- 👤 Donald Irvin Hoke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:41
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; C08; C08F; C08F28/00
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) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |