Patent US2834821A successfully refreshed from Google Patents.
US2834821A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of xylene-ethylbenzene mixtures
Assignee: Union Oil Company of California
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Filing: 1954-06-21
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Granted: 1958-05-13
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Expires: 1974-06-21
Abstract
No abstract record available.
Inventors
- 👤 Bergsteinsson Ingolfur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:32
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/14875; C07C7/14883
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A PROCESS FOR REMOVING ETHYLBENZENE FROM A MIXTURE THEREOF WITH AT LEAST ONE XYLENE ISOMER WHICH COMPRISES SUBJECTING SAID MIXTURE TO A TEMPERATURE BETWEEN ABOUT 170* AND 450*C. IN THE PRESENCE OF A CATALYST CONSISTING ESSENTIALLY OF ACTIVATED ALUMINA-SILICA AND BETWEEN ABOUT 1 TO 50 MOLES OF A FUSED-RING AROMATIC HYDROCARBON PER MOLE OF ETHYLBENZENE, FOR A SUFFICIENT LENGTH OF TIME TO TRANSFER SUBSTANTIALLY ALL OF THE ETHYL GROUPS FROM ETHYLBENZENE TO SAID FUSED-RING HYDROCARBON, AND THEREAFTER RECOVERING SUBSTANTIALLY ETHYLBENZENE-FREE XYLENE.
Claim 2
Dependent Claim
81 words
A PROCESS FOR REMOVING ETHYLBENZENE FROM A MIXTURE THEREOF WITH AT LEAST ONE XYLENE ISOMER WHICH COMPRISES SUBJECTING SAID MIXTURE TO A TEMPERATURE BETWEEN ABOUT 170* AND 450*C. IN THE PRESENCE OF A CATALYST CONSISTING ESSENTIALLY OF ACTIVATED ALUMINA-SILICA AND BETWEEN ABOUT 1 TO 50 MOLES OF A FUSED-RING AROMATIC HYDROCARBON PER MOLE OF ETHYLBENZENE, FOR A SUFFICIENT LENGTH OF TIME TO TRANSFER SUBSTANTIALLY ALL OF THE ETHYL GROUPS FROM ETHYLBENZENE TO SAID FUSED-RING HYDROCARBON, AND THEREAFTER RECOVERING SUBSTANTIALLY ETHYLBENZENE-FREE XYLENE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-12 | 1961-11-11 | 1962-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-12 | 1965-11-11 | 1966-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-12 | 1969-11-11 | 1970-05-13 | $7700.00 | Window Closed / Lapsed |