US2232944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of 1-carbalkoxybutadienes-1,3
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1939-12-21
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Granted: 1941-02-25
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Expires: 1959-12-21
Abstract
No abstract record available.
Inventors
- 👤 Gudgeon Herbert
- 👤 Hill Rowland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:59
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/52; C07C69/587
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) | 1944-02-25 | 1944-08-26 | 1945-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-02-25 | 1948-08-26 | 1949-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-02-25 | 1952-08-26 | 1953-02-25 | $7700.00 | Window Closed / Lapsed |