Patent US2884057A successfully refreshed from Google Patents.
US2884057A
Expired / Lapsed
US
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Paper of improved dry strength and method of making same
Assignee: Wyeth Holdings LLC
•
Filing: 1954-02-25
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Granted: 1959-04-28
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Expires: 1974-02-25
Abstract
No abstract record available.
Inventors
- 👤 Lucius H Wilson
- 👤 Walter M Thomas
- 👤 John J Padbury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:34
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/35; D21H17/37; D21H17/375; D21H17/41; D21H17/44; D21H17/45; D21H17/455
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2677679A
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US2676166A
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US2698793A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-27 | 1962-10-27 | 1963-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-27 | 1966-10-27 | 1967-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-27 | 1970-10-27 | 1971-04-28 | $7700.00 | Window Closed / Lapsed |