Patent US2451040A successfully refreshed from Google Patents.
US2451040A
Expired / Lapsed
US
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Process for production of butadiene
Assignee: Standard Oil Development Co
•
Filing: 1942-05-02
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Granted: 1948-10-12
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Expires: 1962-05-02
Abstract
No abstract record available.
Inventors
- 👤 Eger V Murphree
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:43
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/02; B01J8/0278; C; C07; C07C; C07C5/00; C07C5/32; C07C5/327; C07C5/333; C07C5/3332; Y; Y10; Y10S; Y10S585/00; Y10S585/919; Y10S585/921; Y10S585/949; Y10S585/955
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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Cited
US1821333A
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US2209973A
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US2209215A
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US2232736A
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US2110829A
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US2265641A
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US2245145A
Cited
US2301044A
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US2315107A
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US2367623A
Cited
US2353509A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-12 | 1952-04-12 | 1952-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-12 | 1956-04-12 | 1956-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-12 | 1960-04-12 | 1960-10-12 | $7700.00 | Window Closed / Lapsed |