US3772259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2-vinyl-1-cycloamidinepropionamide polymers
Assignee: Wyeth Holdings LLC
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Filing: 1971-01-18
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Granted: 1973-11-13
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Expires: 1991-01-18
Abstract
Abstract WATER-SOLUBLE CATIONIC SUBSTANTIALLY LINEAR POLYMERS WHICH CONSIST ESSENTIALLY OF 2-VINYL-1-CYCLOAMIDINE-PROPIONAMIDE LINAKGES ARE EFFECTIVE FLOCCULANTS FOR SOLIDS SUSPENDED IN AQUEOUS STATE. WHEN CARRYING A SUFFICIENT NUMBER OF GLYOXAL SUBSTITUENTS TO BE THERMOSETTING, THE POLYMERS ARE WET-STRENGHTENING AGENTS FOR PAPER. WET STRENGTH PAPER MADE BY USE OF THIS POLYMER LOSES ABOUT HALF OF ITS WET STRENGTH ON NORMAL WET WEATHERING, THUS ALLEVIATING THE LITTER PROBLEM.
Inventors
- 👤 Williams L Lyman
- 👤 A Coscia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:12
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; C; C08; C08F; C08F8/00; D21H21/00; D21H21/14; D21H21/18; D21H21/20
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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |