US3364277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dehydrogenating olefins to diolefins in the presence of a yellow iron oxide catalyst
Assignee: Shell USA Inc
•
Filing: 1965-05-21
•
Granted: 1968-01-16
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Expires: 1985-05-21
Abstract
No abstract record available.
Inventors
- 👤 Roy C Siem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:55
CPC Classifications
C; C07; C07C; C07C11/00; C07C11/12; C07C5/00; C07C5/32; C07C5/327; C07C5/333; C07C5/3332; Y; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/906
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2891956A
Cited
US2848521A
Cited
US2866790A
Cited
US2939767A
Cited
US2990432A
Cited
US2916531A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-01-15 | 1971-07-17 | 1972-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-15 | 1975-07-17 | 1976-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-15 | 1979-07-17 | 1980-01-16 | $7700.00 | Window Closed / Lapsed |