US2448259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unsaturated esters of substituted adipic acid and their production
Assignee: Shell Development Co
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Filing: 1944-10-16
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Granted: 1948-08-31
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Expires: 1964-10-16
Abstract
No abstract record available.
Inventors
- 👤 Harry De V Finch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:43
CPC Classifications
C; C08; C08F; C08F18/00; C08F18/02; C08F18/04; C08F18/08; C07; C07C; C07C69/00; C07C69/34; C07C69/44; C08F18/12
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) | 1951-08-31 | 1952-03-01 | 1952-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-31 | 1956-03-01 | 1956-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-31 | 1960-03-01 | 1960-08-31 | $7700.00 | Window Closed / Lapsed |