US2842604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of mixtures of alkyl-substituted aromatic hydrocarbons with aluminum halides
Assignee: Shell Development Co
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Filing: 1953-02-16
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Granted: 1958-07-08
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Expires: 1973-02-16
Abstract
No abstract record available.
Inventors
- 👤 Waals Joan Henri Van Der
- 👤 Dallinga Geert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:42
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A METHOD FOR EXTRACTING META-XYLENE FROM A MIXTURE OF ISOMERIC ALKYL BENZENES HAVING THE EMPIRICAL FORMULA C8H10 WHICH COMPRISES INTRODUCING THE MIXTURE TO AN INTERMEDIATE STAGE OF A PLURAL STAGE LIQUID-LIQUID CONTACTING ZONE MAINTAINED AT A TEMPERATURE LOWER THAN ABOUT 25*C., INTRODUCING A NON-AROMATIC HYDROCARBON AND A HYDROGEN HALIDE INTO ONE END OF SAID CONTACTING ZONE, INTRODUCING A HYDROGEN HALIDE AND FROM ABOUT 50% TO ABOUT 150% BY WEIGHT, BASED ON SAID MIXTURE, OF AN
Claim 2
Independent Claim
75 words
A METHOD FOR EXTRACTING META-XYLENE FROM A MIXTURE OF ISOMERIC ALKYL BENZENES HAVING THE EMPIRICAL FORMULA C8H10 WHICH COMPRISES INTRODUCING THE MIXTURE TO AN INTERMEDIATE STAGE OF A PLURAL STAGE LIQUID-LIQUID CONTACTING ZONE MAINTAINED AT A TEMPERATURE LOWER THAN ABOUT 25*C., INTRODUCING A NON-AROMATIC HYDROCARBON AND A HYDROGEN HALIDE INTO ONE END OF SAID CONTACTING ZONE, INTRODUCING A HYDROGEN HALIDE AND FROM ABOUT 50% TO ABOUT 150% BY WEIGHT, BASED ON SAID MIXTURE, OF AN
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) | 1961-07-07 | 1962-01-06 | 1962-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-07 | 1966-01-06 | 1966-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-07 | 1970-01-06 | 1970-07-08 | $7700.00 | Window Closed / Lapsed |