US3410828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acrolein-n-vinyl pyrrolidone copolymer and cationic derivative paper wet-strength agents
Assignee: ChampionX LLC
•
Filing: 1966-11-23
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Granted: 1968-11-12
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Expires: 1986-11-23
Abstract
No abstract record available.
Inventors
- 👤 George T Kekish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:32
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/18; C08F; C08F26/00; C08F26/06; C08F8/00; C08F8/30; C08F8/32; C08F8/44; C08G2/26; D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H21/00; D21H21/14; D21H21/18; D21H21/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3129195A
Cited
US3323980A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-12 | 1972-05-13 | 1972-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-12 | 1976-05-13 | 1976-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-12 | 1980-05-13 | 1980-11-12 | $7700.00 | Window Closed / Lapsed |