US2733274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of phenols
Assignee: —
•
Filing: —
•
Granted: 1956-01-31
•
Expires: 1973-01-31
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:25
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/11; C07C37/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A PROCESS FOR THE PRODUCTION OF 3-METHYL-4-, 6-DITERTIARY BUTYL PHENOL AND 4-METHYL-2, 6-DI-TERTIARY BUTYL PHENOL, WHICH COMPRISES THE STEPS OF CONTACTING A MIXTURE COMPRISING PREDOMINANTLY META AND PARA CRESOLS IN THE PRESENCE OF A CATALYTIC QUANTITY OF AT LEAST ONE CRESOL SULPHONIC ACID WITH GASEOUS ISOBUTENE WHILE SAID MIXTURE IS MAINTAINED AT A TEMPERATURE WITHIN THE RANGE OF 20* TO 50* C. UNTIL 2 MOLS OF ISOBUTENE HAVE BEEN ADDED FOR EVERY MOL OF CRESOL PRESENT, WHEREBY THE DESIRED METHYL DI-TERTIARY BUTYL PHENOLS ARE OBTAINED, AND THEREAFTER SEPARATING FROM THE REACTION MIXTURE THE DESIRED PHENOLS.
Claim 2
Dependent Claim
95 words
A PROCESS FOR THE PRODUCTION OF 3-METHYL-4-, 6-DITERTIARY BUTYL PHENOL AND 4-METHYL-2, 6-DI-TERTIARY BUTYL PHENOL, WHICH COMPRISES THE STEPS OF CONTACTING A MIXTURE COMPRISING PREDOMINANTLY META AND PARA CRESOLS IN THE PRESENCE OF A CATALYTIC QUANTITY OF AT LEAST ONE CRESOL SULPHONIC ACID WITH GASEOUS ISOBUTENE WHILE SAID MIXTURE IS MAINTAINED AT A TEMPERATURE WITHIN THE RANGE OF 20* TO 50* C. UNTIL 2 MOLS OF ISOBUTENE HAVE BEEN ADDED FOR EVERY MOL OF CRESOL PRESENT, WHEREBY THE DESIRED METHYL DI-TERTIARY BUTYL PHENOLS ARE OBTAINED, AND THEREAFTER SEPARATING FROM THE REACTION MIXTURE THE DESIRED PHENOLS.
References Cited (Backward Citations)
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Cited
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Cited
US2149759A
Cited
US2181823A
Cited
US2297588A
Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-30 | 1959-08-01 | 1960-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-30 | 1963-08-01 | 1964-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-30 | 1967-08-01 | 1968-01-31 | $7700.00 | Window Closed / Lapsed |