US2473995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthesis of diethyl ketone
Assignee: EIDP Inc
•
Filing: 1946-06-19
•
Granted: 1949-06-21
•
Expires: 1966-06-19
Abstract
No abstract record available.
Inventors
- 👤 William F Gresham
- 👤 Richard E Brooks
- 👤 William E Grigsby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:49
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/49; C07C45/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2327066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-20 | 1952-12-20 | 1953-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-20 | 1956-12-20 | 1957-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-20 | 1960-12-20 | 1961-06-21 | $7700.00 | Window Closed / Lapsed |