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US3445330A
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US
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Method of sizing paper with carboxylic acid anhydride particles and polyamines
Assignee: Wyeth Holdings LLC
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Filing: 1966-04-28
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Granted: 1969-05-20
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Expires: 1986-04-28
Abstract
No abstract record available.
Inventors
- 👤 Russell Joseph Kulick
- 👤 Edward Strazdins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:18
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/54; D21H17/55
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2099363A
Cited
US2595935A
Cited
GB804504A
Cited
US2935436A
Cited
US3058873A
Cited
US3084092A
Cited
US3248353A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-19 | 1972-11-18 | 1973-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-19 | 1976-11-18 | 1977-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-19 | 1980-11-18 | 1981-05-20 | $7700.00 | Window Closed / Lapsed |