Patent US2422754A successfully refreshed from Google Patents.
US2422754A
Expired / Lapsed
US
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Preparation of polyvinyl acetal resins
Assignee: EIDP Inc
•
Filing: 1943-03-13
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Granted: 1947-06-24
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Expires: 1963-03-13
Abstract
No abstract record available.
Inventors
- 👤 Stamatoff Gelu Stoeff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:53
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1955068A
Cited
US2120927A
Cited
US2122277A
Cited
US2227975A
Cited
US2360308A
Cited
US2253078A
Cited
US2356479A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-23 | 1950-12-23 | 1951-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-23 | 1954-12-23 | 1955-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-23 | 1958-12-23 | 1959-06-24 | $7700.00 | Window Closed / Lapsed |