Patent US2998440A successfully refreshed from Google Patents.
US2998440A
Expired / Lapsed
US
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Polymeric compositions
Assignee: Ethyl Corp
•
Filing: 1956-12-31
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Granted: 1961-08-29
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Expires: 1976-12-31
Abstract
No abstract record available.
Inventors
- 👤 Walter E Foster
- 👤 Paul E Koenig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:23
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/48; C08G77/58; C08G79/00; C08G79/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2467177A
Cited
US2512063A
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US2455880A
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US2515024A
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US2517945A
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US2775563A
Cited
US2858294A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |