Patent US2423951A successfully refreshed from Google Patents.
US2423951A
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Catalytic process for the production of butadiene and catalyst therefor
Assignee: Rohm and Haas Co
•
Filing: 1944-08-30
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Granted: 1947-07-15
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Expires: 1964-08-30
Abstract
No abstract record available.
Inventors
- 👤 Le Roy U Spence
- 👤 Darrel J Butterbaugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:34
CPC Classifications
C; C07; C07C; C07C1/00; C07C1/20; C07C2521/00; C07C2521/06; C07C2521/08; C07C2523/00; C07C2523/06; C07C2523/16; C07C2523/24; C07C2523/30; C07C2527/00; C07C2527/14; C07C2527/16; C07C2527/167
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1577189A
Cited
DE577630C
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US1809978A
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US2265641A
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US2204157A
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US2272301A
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US2357855A
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US2374433A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-07-14 | 1951-01-13 | 1951-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-14 | 1955-01-13 | 1955-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-14 | 1959-01-13 | 1959-07-15 | $7700.00 | Window Closed / Lapsed |