Patent US2238550A successfully refreshed from Google Patents.
US3375291A
Expired / Lapsed
US
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Process for preparing diolefins
Assignee: Standard Oil Co
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Filing: 1964-03-31
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Granted: 1968-03-26
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Expires: 1984-03-31
Abstract
No abstract record available.
Inventors
- 👤 James L Callahan
- 👤 Ernest C Milberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:21
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/42; C07C5/48; B; B01; B01J; B01J21/00; B01J23/00; B01J23/16; B01J23/18; B01J23/70; B01J23/76; B01J23/84; B01J23/843; B01J23/8435
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-26 | 1971-09-25 | 1972-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-26 | 1975-09-25 | 1976-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-26 | 1979-09-25 | 1980-03-26 | $7700.00 | Window Closed / Lapsed |