US2475296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic polymerization of allyl esters
Assignee: Shell Development Co
•
Filing: 1946-11-06
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Granted: 1949-07-05
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Expires: 1966-11-06
Abstract
No abstract record available.
Inventors
- 👤 Edward C Shokal
- 👤 Franklin A Bent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:27
CPC Classifications
C; C08; C08F; C08F18/00; C08F18/02; C08F18/04; C08F18/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2160933A
Cited
US2339058A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-07-04 | 1953-01-03 | 1953-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-04 | 1957-01-03 | 1957-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-04 | 1961-01-03 | 1961-07-05 | $7700.00 | Window Closed / Lapsed |