Patent US2426494A successfully refreshed from Google Patents.
US3556932A
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Water-soluble,ionic,glyoxylated,vinylamide,wet-strength resin and paper made therewith
Assignee: Wyeth Holdings LLC
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Filing: 1968-07-17
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Granted: 1971-01-19
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Expires: 1988-07-17
Abstract
Abstract THE IONIC-HYDROPHILIC VINYLAMIDE POLYMERS WHICH HAVE SUFFICIENT -CHOHCHO SUBSTITUENTS TO BE THERMOSETTING POSSES THE PROPERTY OF PROVIDING PAPER WITH WET AND DRY STRENGTH RAPIDLY AT NEUTRAL PH, WITH OR WITHOUR EXPOSURE TO THERMOSETTING TEMPERATURES. THE PAPER RAPIDLY BECOMES A PULP SUITABLE FOR RE-USE WHEN SLURRIED IN WATER HAVING A MILDLY ALKALINE PH. BLENDS OF IONIC-HYDROPHILIC VINYLAMIDE POLYMERS AND GLYOXAL ARE STORAGE STABLE WHEN DRY, YET FORM THE ABOVE-DESCRIBED THERMOSETTING POLYMERS WHEN THEY ARE DISSOLVED IN WATER AT ROOM TEMPERATURE AND THE RESULTING SOLUTION IS AGED.
Inventors
- 👤 Anthony Thomas Coscia
- 👤 Laurence Lyman Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:32
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; C08F8/28; C08F8/44; C08G; C08G69/00; C08G69/48; C08G73/00; C08G73/02; C08G73/0233; C08L; C08L33/00; C08L33/24; C08L33/26; D21H17/21; D21H17/24; D21H17/28; D21H17/29; D21H17/34; D21H17/37; D21H17/38; D21H17/39; D21H17/41; D21H17/44; D21H17/45; D21H17/455; D21H17/46; D21H17/54; C08F2800/00; C08F2800/10; C08F2810/00; C08F2810/20; C08J; C08J5/00; C08J5/18; 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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |