USRE27639E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Certificate of correction
Assignee: —
•
Filing: 1971-11-16
•
Granted: 1973-05-08
•
Expires: 1991-11-16
Abstract
Abstract THERE IS DISCLOSED A PROCESS FOR CATALYTICALLY DISPROPORTIONATING TOLUENE TO BENZENE AND XYLENES. THE TOLUENE IS DISPROPORTIONATED OVER A RARE-EARTH AND HYDROGENEXCHANGED CRYSTALLINE AUMINOSILICATE CATALYST AT ABOUT ATMOSPHERIC PRESSURE AND A TEMPERATURE OF ABOUT 700 TO 1100*F. METHYLAROMATICS OF 9 TO 10 CARBON ATOMS AND 1 TO 4 METHYL GROUPS MAY ALSO BE INTRODUCED INTO THE REACTION ZONE TO INCREASE THE XYLENE/BENZENE RATIO IN THE PRODUCT.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:45
CPC Classifications
C; C07; C07C; C07C6/00; C07C6/08; C07C6/12; C07C6/123
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |