US2451485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of unsaturated carbonylic compounds
Assignee: Shell Development Co
•
Filing: 1947-09-27
•
Granted: 1948-10-19
•
Expires: 1967-09-27
Abstract
No abstract record available.
Inventors
- 👤 George W Hearne
- 👤 Merrill L Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:05
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/27; C07C45/32; C07C45/33; C07C45/34; C07C45/35
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE350922C
Cited
FR744401A
Cited
US2186688A
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US2066622A
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US2273573A
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US2283711A
Cited
US2400959A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-19 | 1952-04-19 | 1952-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-19 | 1956-04-19 | 1956-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-19 | 1960-04-19 | 1960-10-19 | $7700.00 | Window Closed / Lapsed |