Patent US2420906A successfully refreshed from Google Patents.
US2420906A
Expired / Lapsed
US
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Butadiene extraction
Assignee: Standard Oil Development Co
•
Filing: 1942-08-29
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Granted: 1947-05-20
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Expires: 1962-08-29
Abstract
No abstract record available.
Inventors
- 👤 John W Packie
- 👤 Richard A Given
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:02
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/10; C07C7/005; C07C7/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1282906A
Cited
US1651328A
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GB390863A
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US2081719A
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US2005500A
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US2216602A
Cited
US2154676A
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US2188899A
Cited
GB532821A
Cited
US2275135A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-19 | 1950-11-18 | 1951-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-19 | 1954-11-18 | 1955-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-19 | 1958-11-18 | 1959-05-20 | $7700.00 | Window Closed / Lapsed |