US3790642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective disproportionation of cresols
Assignee: Asahi Kasei Corp
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Filing: 1971-06-08
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Granted: 1974-02-05
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Expires: 1991-06-08
Abstract
Abstract AN IMPROVED PROCESS FOR THE PREPARATION OF PHENOL OLS BY A DISPROPORTIONATION REACTION CHARACTERIZED IN THAT THE DISPROPORTIONATION REACTION IS EFFECTED WITH HEATING IN THE PRESENCE OF AN ALUMINA CATALYST HAVING AMMONIUM THIOCYANATE INCORPORATED THEREIN OR AN ALUMINA CATALYST HAVING AMMONIUM THIOCYANATE TOGETHER WITH AT LEAST ONE OF METALS CO, NI, PD AND RH INCORPORATED THEREIN. THIS PROCESS CAN SELECTIVELY PROVIDE AS A MAIN PRODUCT A XYLENOL HAVING A METHYL GROUP AT THE ORTHO POSITION, WHICH IS USEFUL AS A RAW MATERIAL FOR THE PRODUCTION OF INDUSTRIAL CHEMICALS.
Inventors
- 👤 N Kominami
- 👤 E Yamamoto
- 👤 N Tamura
- 👤 H Mikami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:13
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/48
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) | 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 |