US3766291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Para xylene production
Assignee: Phillips Petroleum Co
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Filing: 1972-03-24
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Granted: 1973-10-16
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Expires: 1992-03-24
Abstract
Abstract A FEEDSTOCK COMPRISING 3-METHYLBUTENE-1- IS CONVERTED TO PARA-XYLENE BY DISPROPORTIONATION TO 2,5-DIMETHYLHEXENE WHICH IS SUBSEQUENTLY DEHYDROCYCLIZED OVER A CATALYST COMPRISING AT LEAST ONE GROUP VIII METAL IN ASSOCIATION WITH TIN IN COMBINATION WITH A GROUP II ALUMINATE SPINEL SUPPORT MATERIAL.
Inventors
- 👤 L Drehman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:26
CPC Classifications
C; C07; C07C; C07C15/00; C07C15/02; C07C15/067; C07C15/08; C07C5/00; C07C5/22; C07C5/23; C07C5/25; C07C5/2506; C07C5/2512; C07C5/2556; C07C5/32; C07C5/327; C07C5/333; C07C5/3335; C07C5/3337; C07C5/373; C07C5/393; C07C5/41; C07C5/415; C07C5/417; C07C6/00; C07C6/02; C07C6/04
Claims Analysis
Total Claims: 0
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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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |