Patent US2224912A successfully refreshed from Google Patents.
US2224912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of butadiene
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1937-07-16
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Granted: 1940-12-17
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Expires: 1957-07-16
Abstract
No abstract record available.
Inventors
- 👤 Hill Rowland
- 👤 Isaacs Elias
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:53
CPC Classifications
C; C07; C07C; C07C1/00; C07C1/20; C07C1/207; C07C1/213; Y; Y10; Y10S; Y10S585/00; Y10S585/929; Y10S585/93; Y10S585/932
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) | 1943-12-17 | 1944-06-17 | 1944-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-12-17 | 1948-06-17 | 1948-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-12-17 | 1952-06-17 | 1952-12-17 | $7700.00 | Window Closed / Lapsed |