Patent US3391214A successfully refreshed from Google Patents.
US3391214A
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Isoprene production from isopentane via hydroperoxide
Assignee: Shell USA Inc
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Filing: 1967-06-12
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Granted: 1968-07-02
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Expires: 1987-06-12
Abstract
No abstract record available.
Inventors
- 👤 Lloyd C Fetterly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:00
CPC Classifications
C; C07; C07D; C07D301/00; C07D301/02; C07D301/03; C07D301/19; C07C; C07C1/00; C07C1/20; C07C1/24; C07C1/247; C07C11/00; C07C11/12; C07C11/173; C07C11/18; C07C29/00; C07C29/132; C07C407/00; C07C409/00; C07C409/02; C07C409/04; C07D303/00; C07D303/02; C07D303/04; C07C2523/00; C07C2523/12; Y; Y10; Y10S; Y10S585/00; Y10S585/929; Y10S585/93; Y10S585/931; Y10S585/934
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) | 1971-07-02 | 1972-01-01 | 1972-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-02 | 1976-01-01 | 1976-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-02 | 1980-01-01 | 1980-07-02 | $7700.00 | Window Closed / Lapsed |