Patent US2457261A successfully refreshed from Google Patents.
US2457261A
Expired / Lapsed
US
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Polyvinyl acetal resins
Assignee: Shawinigan Chemicals Ltd
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Filing: 1945-05-16
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Granted: 1948-12-28
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Expires: 1965-05-16
Abstract
No abstract record available.
Inventors
- 👤 Morrison George Osman
- 👤 Lossing Frederick Pettit
- 👤 Heatley Albert Harold
- 👤 Germain Joseph Frederic Marcel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:13
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/28
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) | 1951-12-28 | 1952-06-28 | 1952-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-28 | 1956-06-28 | 1956-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-28 | 1960-06-28 | 1960-12-28 | $7700.00 | Window Closed / Lapsed |