US3733327A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic oxydehydrogenation of alkyl aromatics and alkyl pyridines
Assignee: Dow Chemical Co
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Filing: 1971-06-28
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Granted: 1973-05-15
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Expires: 1991-06-28
Abstract
Abstract OXYDEHYDROGENATION OF ALKYL AROMATIC COMPOUNDS INCLUDING NITROGEN HETEROCYCLICS HAVING AT LEAST ONE C2-C6 ALKYL SIDE CHAIN HAVING AT LEAST ONE HYDROGEN ATOM ON THE CARBON ATOM OF THE ALKYL GROUP ATTACHED TO THE AROMATIC RING AND 1-2 RINGS, BY PASSING A MIXTURE OF THE ALKYL AROMATIC COMPOUND AND AN OXYGEN CONTAINING GAS OVER A CERIUM PHOSPHATE OR CERIUM-ZIRCONIUM PHOSPHATE CATALYST AT 400-650*C. CONVERTS SAID C2-C6 ALKYL GROUPS TO ALKENE DERIVATIVES, WITH GOOD SELECTIVITY AND CONVERSION.
Inventors
- 👤 G Vrieland
- 👤 H Beck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:00
CPC Classifications
C; C07; C07C; C07C17/00; B; B01; B01J; B01J27/00; B01J27/14; B01J27/16; B01J27/18; C07C17/35; C07C17/357; C07C5/00; C07C5/42; C07C5/48; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/06
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |