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Patent US2407508A successfully refreshed from Google Patents.
US2407508A
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Unsaturated bicyclic carbonylic compounds and their preparation
Assignee: Shell Development Co
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Filing: 1944-04-26
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Granted: 1946-09-10
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Expires: 1964-04-26
Abstract
No abstract record available.
Inventors
- 👤 Rupert C Morris
- 👤 Edward C Shokal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:40
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/61; C07C45/67; C07C45/68; C07C45/69; C07C47/00; C07C47/38; C07C47/44; C07C47/445; C07C49/00; C07C49/527; C07C49/553
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1949-09-09 | 1950-03-11 | 1950-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-09-09 | 1954-03-11 | 1954-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-09-09 | 1958-03-11 | 1958-09-10 | $7700.00 | Window Closed / Lapsed |