US2395057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery method in process for making butadiene
Assignee: Carbide and Carbon Chemicals Corp
•
Filing: 1944-05-02
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Granted: 1946-02-19
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Expires: 1964-05-02
Abstract
No abstract record available.
Inventors
- 👤 Jay L Marsh
- 👤 Melville E Hitchcock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:15
CPC Classifications
C; C07; C07C; C07C1/00; C07C1/20; C07C1/207; C07C1/2072; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
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) | 1949-02-18 | 1949-08-20 | 1950-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-02-18 | 1953-08-20 | 1954-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-02-18 | 1957-08-20 | 1958-02-19 | $7700.00 | Window Closed / Lapsed |