Patent US2781407A successfully refreshed from Google Patents.
US2781407A
Expired / Lapsed
US
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Preparation of alkyl-substituted aromatic compounds
Assignee: Universal Oil Products Co
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Filing: 1955-01-28
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Granted: 1957-02-12
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Expires: 1975-01-28
Abstract
No abstract record available.
Inventors
- 👤 Schmerling Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:39
CPC Classifications
C; C07; C07C; C07C1/00; C07C1/20; C07C1/247
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A PROCESS FOR THE PREPARATION OF AN AROMATIC HYDROCARBON CONTAINING AT LEAST ONE ALKUL SUBSTITUENT WHICH COMPRISES CONDENSING AN ALKYLFURAN WITH AN ALKKENE, AND AROMATIZING THE RESULTANT EPOXIDE IN THE PRESENCE OF A HYDROGEN HALIDE AND AN ORGANIC ACID AT AN AROMATIZING TEMPEATURE OF FROM ABOUT 0* TO ABOUT 150*C. TO FORM THE DESIRED ALKYL-SUBSTITUTED AROMATIC HYDROCARBON.
Claim 2
Dependent Claim
40 words
A PROCESS FOR THE PREPARATION OF PARA-XYLENE WHICH COMPRISES CONDENSING 2,5-DIMETHYLFURAN WITH ETHYLENE AND AROMATIZING THE RESULTANT EPOXIDE IN THE PRESENCE OF HYDROGEN BROMIDE IN ACETIC ACID AT AN AROMATIZING TEMPERATURE OF FROM ABOUT 0* TO 150*C. TO FORM PARAXYLENE.
References Cited (Backward Citations)
US2325576A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-12 | 1960-08-13 | 1961-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-12 | 1964-08-13 | 1965-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-12 | 1968-08-13 | 1969-02-12 | $7700.00 | Window Closed / Lapsed |