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US2396557A
Expired / Lapsed
US
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Stabilization of polyvinyl acetal
Assignee: Wingfoot Corp
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Filing: 1942-12-29
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Granted: 1946-03-12
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Expires: 1962-12-29
Abstract
No abstract record available.
Inventors
- 👤 Fred W Cox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:43
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/17; C08K5/34; C08K5/3442; C08K5/3462
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1949-03-11 | 1949-09-10 | 1950-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-03-11 | 1953-09-10 | 1954-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-03-11 | 1957-09-10 | 1958-03-12 | $7700.00 | Window Closed / Lapsed |