US3761350A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermosetting wet strength resin
Assignee: Hercules LLC
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Filing: 1971-06-23
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Granted: 1973-09-25
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Expires: 1991-06-23
Abstract
Abstract CATIONIC THERMOSETTING RESINS USEFUL IN IMPARTING WET STRENGTH TO PAPER ARE PREPARED BY REACTING A HETEROCYCLIC DICARBOXYLIC ACID OF THE FORMULA HOOC-R-N<(-CO-CH2-CH(-COOH)-CH2-) WHERE R IS ALKYLENE OR ARYLENE WITH A DIAMINE OR POLYALKYLENE POLYAMINE, AND EPICHLOROHYDRIN TO FORM A WATERSOLUBLE POLYAMINE POLYAMIDE POLYMER, AND THEN, REACTING THE SAID POLYMER WITH FURTHER EPICHLOROHYDRIN. AN AMINO CARBONYL COMPOUND MAY BE INCLUDED AS A FOURTH REACTANT IN FORMING THE WATER-SOLUBLE POLYAMINE POLYAMIDE POLYMER.
Inventors
- 👤 F Munjat
- 👤 Ho Kim Sin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:20
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/54; D21H17/55; C; C08; C08G; C08G69/00; C08G69/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |