Patent US2783250A successfully refreshed from Google Patents.
US2783250A
Expired / Lapsed
US
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Unsaturated esters of epoxy-substituted polycarboxylic acids and polymers
Assignee: Shell Development Co
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Filing: 1954-06-28
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Granted: 1957-02-26
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Expires: 1974-06-28
Abstract
No abstract record available.
Inventors
- 👤 George B Payne
- 👤 Curtis W Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:09
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/15; C08K5/151; C08K5/1515; C07; C07D; C07D303/00; C07D303/02; C07D303/38; C07D303/40; C08F; C08F18/00; C08F18/02; C08G; C08G59/00; C08G59/02; C08G59/12; C08G59/18; C08G59/20; C08G59/22
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) | 1960-02-26 | 1960-08-27 | 1961-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-26 | 1964-08-27 | 1965-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-26 | 1968-08-27 | 1969-02-26 | $7700.00 | Window Closed / Lapsed |