Patent US4323056A successfully refreshed from Google Patents.
US2743261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymer of alpha-dibutylphosphonatostyrene and acrylonitrile
Assignee: Eastman Kodak Co
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Filing: 1953-01-21
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Granted: 1956-04-24
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Expires: 1973-01-21
Abstract
No abstract record available.
Inventors
- 👤 Jr Harry W Coover
- 👤 Joseph B Dickey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:46
CPC Classifications
C; C08; C08F; C08F30/00; C08F30/02; 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) | 1959-04-24 | 1959-10-24 | 1960-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-24 | 1963-10-24 | 1964-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-24 | 1967-10-24 | 1968-04-24 | $7700.00 | Window Closed / Lapsed |