US3597313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyaldehyde crosslinked aliphatic alcohol resins and a process of making temporary wet strength paper and paper made therefrom
Assignee: Wyeth Holdings LLC
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Filing: 1968-09-23
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Granted: 1971-08-03
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Expires: 1988-09-23
Abstract
Abstract WET-STRENGTH RESINS ARE PROVIDED WHICH AFFORD TEMPORARY WET STRENGTH TO PAPER PRODUCTS. THE RESINS ARE CATIONIC POLYMERS OF UNSATURATED ALIPHATIC ALCOHOLS REACTED WITH POLYALDEHYDES. THEY ARE PREPARED, FOR EXAMPLE, BY CYANAMIDE MODIFICATION OF POLYVINYL ALCOHOL POLYMERS, FOLLOWED BY GLYOXAL CROSS-LINKING; OR BY COPOLYMERIZATION OF VINYL ACETATE AND DIALLYLDIMETHYLAMMONIUM CHLORIDE, FOLLOWED BY HYDROLYSIS AND GLYOXAL CROSS-LINKING. THESE RESINS ARE ADSORBED ON PAPERMAKING FIBERS IN AQUEOUS SUSPENSION DURING THE PAPERMAKING PROCESS AND IMPART TEMPORARY WET STRENGTH TO RESULTING PAPER PRODUCTS SUCH AS TISSUE, PAPER TOWELS AND THE LIKE.
Inventors
- 👤 Laurence Lyman Williams
- 👤 Anthony Thomas Coscia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:23
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/48; C08F; C08F8/00; C08F8/28; C08F8/30; C08G73/00; C08G73/02; C08G73/0233; D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/36; D21H17/41; D21H17/44; D21H17/45; D21H17/455; C08F2810/00; C08F2810/20
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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |