US3790641A
Expired / Lapsed
US
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Methylation of phenols at ortho-position
Assignee: Kanegafuchi Chemical Industry Co Ltd
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Filing: 1971-05-11
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Granted: 1974-02-05
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Expires: 1991-05-11
Abstract
Abstract PHENOL, CRESOL OR THE LIKE PHENOLS EACH HAVING AT LEAST ONE HYDROGEN ATOM AT ORTHO-POSITION, IS METHYLATED AT ORTHO-POSITION THEREOF IN HIGH SELECTIVITY BY REACTING WITH METHANOL USING A NOVEL CATALYST SYSTEM SELECTED FROM THE LEAST ONE OF THE FOLLOWING GROUPS (A), (B) AND (C): (A) A COMBINATION OF AT LEAST ONE OF MAGNESIUM OXIDE, ZINC OXIDE AND BERYLLIUM OXIDE, AT LEAST ONE OF LATHANIDE OXIDE, SCANDIUM OXIDE AND YTTRIUM OXIDE, AND AT LEAST ONE OF URANIUM OXIDE AND TIN OXIDE; (B) A COMBINATION OF AT LEAST ONE OF SCANDIUM OXIDE, YTTRIUM OXIDE AND LANTHANIDE OXIDE, AND TIN OXIDE; AND (C) A COMBINATION OF AT LEAST ONE OF URANIUM OXIDE AND LANTHANIDE OXIDE, AND ACTIVE CARBON.
Inventors
- 👤 T Kombashiri
- 👤 A Oshima
- 👤 H Oshima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:40
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/12; B01J23/14; C; C07; C07C; C07C37/00; C07C37/11; C07C37/16
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |