Patent US3716589A successfully refreshed from Google Patents.
US3716589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the synthesis of 2,6-dimethylphenols
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1969-11-19
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Granted: 1973-02-13
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Expires: 1989-11-19
Abstract
Abstract A PROCESS IS DISCLOSED FOR METHYLATING THE ORTHO-POSITION OF PHENOLS BY REACTING A MIXED GAS OF PHENOLS AND METHYL ALCOHOL IN THE PRESENCE OF A COMPOSITE CATALYST. THE COMPOSITE CATALYST IS A FERRITE HAVING THE FORMULA MFE2O4 WHERE M IS ZINC, MAGNESIUM, CALCIUM, BARIUM, COBALT, NICKEL, CHROMIUM, MANGANESE, CADMIUM, COPPER, SILVER, COPPER-ZINC, MAGNESIUM-ZINC, AND SILVER-ZINC.
Inventors
- 👤 T Kotanigawa
- 👤 M Yamamoto
- 👤 K Shimokawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:02
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/11; C07C37/16
Claims Analysis
Total Claims: 0
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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) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |