Patent US3734977A successfully refreshed from Google Patents.
US3734977A
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Water-soluble cationic thermosetting acrylamide-grafted glyoxalated alkylamine-epichlorhydrin wet strength resin and paper containing the same
Assignee: Wyeth Holdings LLC
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Filing: 1971-01-18
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Granted: 1973-05-22
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Expires: 1991-01-18
Abstract
Abstract WATER-SOLUBLE LOWER ALKYLAMINE-EPICHLOROHYDRIN POLYMERS WHICH HAVE BEEN GRAFTED WITH AT LEAST 1/3 MOL OF ACRYLAMIDE PER POLYMER LINKAGE AND THEN GLYOXALATED ARE CATIONIC THERMOSETTING WET STRENGTH RESINS. PAPER HAVING A THERMOSET CONTENT THEREOF LOSES ABOUT HALF OFITS WET STRENGTH IN 24 HOURS ON NORMAL WET WEATHERING.
Inventors
- 👤 A Coscia
- 👤 L Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:59
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; C; C08; C08B; C08B31/00; C08B31/08; C08B31/12; C08B31/125; C08F; C08F8/00; C08G; C08G69/00; C08G69/48; C08G73/00; C08G73/02; C08G73/0233; D21H17/21; D21H17/24; D21H17/28; D21H17/29; D21H17/34; D21H17/37; D21H17/41; D21H17/44; D21H17/45; D21H17/455; D21H17/46; D21H17/54; D21H21/00; D21H21/14; D21H21/18; D21H21/20
Claims Analysis
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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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |