US2424186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfuric acid extraction of isobutylene from hydrocarbon mixtures
Assignee: Standard Oil Development Co
•
Filing: 1944-09-12
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Granted: 1947-07-15
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Expires: 1964-09-12
Abstract
No abstract record available.
Inventors
- 👤 John W Packie
- 👤 Walter H Rupp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:48
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/17; C07C7/171
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2190501A
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US2345114A
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US2350558A
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US1991948A
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US1953618A
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US1998411A
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US2128971A
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US2173452A
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US2300818A
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US2355460A
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 |