US3766287A
Expired / Lapsed
US
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Separation of c8 aromatic hydrocarbons
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1971-07-23
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Granted: 1973-10-16
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Expires: 1991-07-23
Abstract
Abstract PARAXYLENE IS RECOVERED FROM A MIXTURE OF XYLENES AND ETHYLBENZENE BY SEPARATING THE MIXTURE INTO TWO STREAMSONE WHICH IS RICH IN ETHYLBENZENE AND ORTHOXYLENE AND ANOTHER WHICH IS RICH IN METAXYLENE-AND SEPARATELY ISOMERIZING THE TWO STREAMS UNDER DIFFERENT CONDITIONS TO OBTAIN A MAXIMUM AMOUNT OF PARAXYLENE. D R A W I N G
Inventors
- 👤 D Stenmark
- 👤 R Wesselhoft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:46
CPC Classifications
C; C07; C07C; C07C15/00; C07C15/02; C07C15/067; C07C5/00; C07C5/22; C07C5/27; C07C5/2702; C07C5/2705; C07C5/2724
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) | 1976-10-15 | 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 |