US3778339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper containing a polyamidepolyamine-epichlorohydrin wet strength resin
Assignee: Wyeth Holdings LLC
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Filing: 1972-04-14
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Granted: 1973-12-11
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Expires: 1992-04-14
Abstract
Abstract WATER-SOLUBLE CATIONIC THERMOSETTING POLYAMIDEPOLYAMINE-EPICHLOROHYDRIN RESINS CONTAINING PHENYLENE LINKAGES ARE PREPARED BY REACTING 1/3 TO 3/4 MOL OF A NONORTHOPHTHALIC ACID WITH 1 MOL OF A WATER-SOLUBLE POLYALKYLENEPOLYAMINE, REACTING THE RESULTING MONOMERIC PHTHALAMIDE WITH 2/3 TO 1/4 MOL OF A C2-C10 SATURATED ALIPHATIC DICARBOXYLIC ACID TO FOR A CHAIN POLYMER (THE TOTAL AMOUNT OF THE ACIDS BEING 3/4 TO 5/4 MOL PER MOL OF THE POLYAMINE), AND RENDERING THE CHAIN POLYMER THERMOSETTING BY REACTON WITH EPICHLOROHYDRIN. THE POLYMERS ARE WET STRENGTH RESINS FOR PAPER.
Inventors
- 👤 Williams L Lyman
- 👤 A Coscia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:30
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/54; D21H17/55; C; C08; C08G; C08G65/00; C08G65/02; C08G65/26; C08G65/2618; C08G65/2633
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |