Patent US2386468A successfully refreshed from Google Patents.
US2386468A
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Process for isomerizing normal butenes to isobutene
Assignee: Universal Oil Products Co
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Filing: 1939-01-11
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Granted: 1945-10-09
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Expires: 1959-01-11
Abstract
No abstract record available.
Inventors
- 👤 Vladimir N Ipatieff
- 👤 Raymond E Schaad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:58
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/20; C; C07; C07C; C07C5/00; C07C5/22; C07C5/27; C07C5/2767; C07C5/277; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1948-10-08 | 1949-04-09 | 1949-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-10-08 | 1953-04-09 | 1953-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-10-08 | 1957-04-09 | 1957-10-09 | $7700.00 | Window Closed / Lapsed |