Patent US4050737A successfully refreshed from Google Patents.
Patent US3594271A successfully refreshed from Google Patents.
US3594271A
Expired / Lapsed
US
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Starch-modified thermosetting melamine formaldehyde acid colloid and paper having dry strength made therewith
Assignee: Wyeth Holdings LLC
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Filing: 1968-07-19
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Granted: 1971-07-20
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Expires: 1988-07-19
Abstract
Abstract THE INVENTION PROVIDES A STARCH-MODIFIED THERMOSETTING MELAMINE-FORMALDEHYDE ACID COLLOID. THE MODIFIED COLLOID IS CATIONIC AND WATER-SOLUBLE, AND IMPARTS EXCELLENT DRY STRENGTH TO PAPER WITHOUT IMPARTING MORE THAN A NEGLIGIBLE AMOUNT OF WET STRENGTH. IT IS PREFERABLY EMPLOYED AS A BEATER ADDITIVE BUT MAY BE APPLIED TO PREFORMED PAPER.
Inventors
- 👤 Norman Thorndike Woodberry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:05
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/47; D21H17/49; D21H17/51; C; C08; C08B; C08B31/00; C08L; C08L3/00; C08L61/00; C08L61/20; C08L61/26; C08L61/28; D21H17/21; D21H17/24; D21H17/28
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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |