US3776892A
Expired / Lapsed
US
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Acrylamide polymer and method of flocculating an aqueous suspension of solid particles therewith
Assignee: WR Grace and Co Conn
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Filing: 1971-07-02
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Granted: 1973-12-04
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Expires: 1991-07-02
Abstract
Abstract POLYMERS CONTAINING A MAJOR AMOUNT OF ACRYLAMIDE COPOLYMERIZED WITH AN ALIPHATIC CARBOXYLIC ACID AND AN AMINOESTER ARE USEFUL FOR FLOCCULATING AQUEOUS SUSPENSION OF FINELY DIVIDED SOLID PARTICLES.
Inventors
- 👤 M Bleyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:44
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; C08; C08F; C08F20/00; C08F20/02; C08F20/52; C08F20/54; C08F20/56
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) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |