Patent US1986484A successfully refreshed from Google Patents.
Patent US2986489A successfully refreshed from Google Patents.
US2986489A
Expired / Lapsed
US
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Melamine resin colloid and manufacture of wet-strength paper therewith
Assignee: Wyeth Holdings LLC
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Filing: 1958-01-28
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Granted: 1961-05-30
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Expires: 1978-01-28
Abstract
No abstract record available.
Inventors
- 👤 Charles S Maxwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:13
CPC Classifications
C; C08; C08L; C08L61/00; C08L61/20; C08L61/26; C08L61/28; C08G; C08G12/00; C08G12/02; C08G12/26; C08G12/30; C08G12/32; D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/47; D21H17/49; D21H17/51
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
107 words
A METHOD OF MAKING WET-STRENGTH PAPER WHICH COMPRISES ADDING TO A WATER SUSPENSION OF CELLULOSIC PAPERMAKING FIBERS AS WET-STRENGTHENING AGENT A MELAMINEFORMALDEHYDE RESIN COLLOID SOLUTION PREPARED BY REACTING AN EFFECTIVE AMOUNT OF FORMALDEHYDE WITHIN THE RANGE OF ABOUT 0.5-15 MOLS PER MOLE OF MELAMINE WITH A COLLOIDAL AQUEOUS SOLUTION OF A PARTIALLY POLYMERIZED, POSITIVELY CHARGED MELAMINE-FORMALDEHYDE CONDENSATION PRODUCT HAVING A PH VALUE WITHIN THE RANGE OF ABOUT 0.5 TO 5 WHEN MEASURED AT 12% RESIN SOLIDS AND A DEGREE OF POLYMERIZATION SUCH THAT THE RESIN PARTICLES ARE WITHIN THE COLLOIDAL RANGE, FORMING THE TREATED FIBERS INTO PAPER, AND HEATING THE PAPER TO CURE THE RESIN ADSORBED THEREIN.
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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) | 1964-05-29 | 1964-11-28 | 1965-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-29 | 1968-11-28 | 1969-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-29 | 1972-11-28 | 1973-05-30 | $7700.00 | Window Closed / Lapsed |