Patent US3728216A successfully refreshed from Google Patents.
US3728216A
Expired / Lapsed
US
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Diallylamine-amide-polyaldehyde resins having utility as wet and dry strengthening agents in papermaking
Assignee: Hercules LLC
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Filing: 1971-03-12
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Granted: 1973-04-17
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Expires: 1991-03-12
Abstract
Abstract WHERE R'' IS METHYLENE OR ETHYLENE, R" IS HYDROGEN OR A LOWER ALKYL RADICAL, R"'' IS A SATURATED OR UNSATURATED ALIPHATIC, CYCLOALIPHATIC OR AROMATIC RADICAL, M IS 0 OR 1 AND N IS AT LEAST 2. ALSO DISCLOSED IS THE PROCESS FOR THE PREPARATION OF THE RESIN AND ITS USE TO IMPART AND WET STRENGTH TO PAPER. 3,5-YLENE)-C- -(1-((O=CH)(N-1)-(R''")M-CH(-OH)-N(-R")-CO-R''-)PIPERIDIN- DISCLOSED ARE RESINS PREPARED FROM A DIALLYLAMINE, AN AMIDE ND A POLYALDEHYDE. THE RESINS HAVE THE FOLLOWING REPEATING UNITS.
Inventors
- 👤 R Bankert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:14
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/38; D21H17/39; C; C08; C08F; C08F8/00
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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |