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US2491471A
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US
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Acrylonitrile-vinylpyridine copolymers
Assignee: EIDP Inc
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Filing: 1948-02-25
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Granted: 1949-12-20
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Expires: 1968-02-25
Abstract
No abstract record available.
Inventors
- 👤 Arnold Harold Wilfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:41
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/70; C; C08; C08F; C08F220/00; C08F220/02; C08F220/42; C08F220/44
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) | 1952-12-19 | 1953-06-20 | 1953-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-19 | 1957-06-20 | 1957-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-19 | 1961-06-20 | 1961-12-20 | $7700.00 | Window Closed / Lapsed |