US3409500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of sizing paper with cationic polyamine and carboxylic anhydride
Assignee: Wyeth Holdings LLC
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Filing: 1966-10-28
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Granted: 1968-11-05
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Expires: 1986-10-28
Abstract
No abstract record available.
Inventors
- 👤 Strazdins Edward
- 👤 Kulick Russell Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:23
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/54; D21H17/56; D21H17/03; D21H17/05; D21H17/14; D21H17/15; D21H17/55; D21H23/00; D21H23/76; D21H23/765
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-05 | 1972-05-06 | 1972-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-05 | 1976-05-06 | 1976-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-05 | 1980-05-06 | 1980-11-05 | $7700.00 | Window Closed / Lapsed |