Patent US3671029A successfully refreshed from Google Patents.
Patent US2923745A successfully refreshed from Google Patents.
US2923745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ortho alkylation of phenols
Assignee: Shell Development Co
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Filing: 1957-10-21
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Granted: 1960-02-02
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Expires: 1977-10-21
Abstract
No abstract record available.
Inventors
- 👤 Vernon W Buls
- 👤 Robert S Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:57
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/11; C07C37/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
A PROCESS FOR THE PREPARATION OF 2,6-DIALKYL PHENOLS, WHICH COMPRISES MIXING AN OLEFIN AND A PHENOL HAVING A REPLACEABLE HYDROGEN ATOM ON THE CARBON ATOM PARA TO THE HYDROXYL GROUP, A REPLACEABLE HYDROGEN ATOM ON ONE OF THE CARBON ATOMS ORTHO TO THE HYDROXYL GROUP, AND ON THE OTHER CARBON ATOM ORTHO TO THE HYDROXYL GROUP A RADICAL SELECTED FROM THE GROUP CONSISTING OF A REPLACEABLE HYDROGEN ATOM AND ALKYL GROUPS HAVING UP TO FOUR CARBON ATOMS, AND AN ALUMINUM HALIDE CATALYST, IN A RATIO OF AT LEAST ABOUT TWO MOLES OF OLEFIN AND FROM ABOUT 0.001 TO 0.20 MOLE OF ALUMINUM HALIDE PER MOLE OF THE PHENOL, HEATING THE RESULTING MIXTURE AT A TEMPERATURE OF AT LEAST ABOUT 100* C. AND A PRESSURE IN EXCESS OF 100 P.S.I.G., AND SEPARATING THE 2,6-DIALKYL PHENOL FROM THE MIXTURE AT SOME TIME BETWEEN THE TIME AT WHICH THE RATIO OF THE MOLAR CONCENTRATIONS
Claim 2
Dependent Claim
151 words
A PROCESS FOR THE PREPARATION OF 2,6-DIALKYL PHENOLS, WHICH COMPRISES MIXING AN OLEFIN AND A PHENOL HAVING A REPLACEABLE HYDROGEN ATOM ON THE CARBON ATOM PARA TO THE HYDROXYL GROUP, A REPLACEABLE HYDROGEN ATOM ON ONE OF THE CARBON ATOMS ORTHO TO THE HYDROXYL GROUP, AND ON THE OTHER CARBON ATOM ORTHO TO THE HYDROXYL GROUP A RADICAL SELECTED FROM THE GROUP CONSISTING OF A REPLACEABLE HYDROGEN ATOM AND ALKYL GROUPS HAVING UP TO FOUR CARBON ATOMS, AND AN ALUMINUM HALIDE CATALYST, IN A RATIO OF AT LEAST ABOUT TWO MOLES OF OLEFIN AND FROM ABOUT 0.001 TO 0.20 MOLE OF ALUMINUM HALIDE PER MOLE OF THE PHENOL, HEATING THE RESULTING MIXTURE AT A TEMPERATURE OF AT LEAST ABOUT 100* C. AND A PRESSURE IN EXCESS OF 100 P.S.I.G., AND SEPARATING THE 2,6-DIALKYL PHENOL FROM THE MIXTURE AT SOME TIME BETWEEN THE TIME AT WHICH THE RATIO OF THE MOLAR CONCENTRATIONS
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) | 1963-02-01 | 1963-08-03 | 1964-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-01 | 1967-08-03 | 1968-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-01 | 1971-08-03 | 1972-02-02 | $7700.00 | Window Closed / Lapsed |