US3658852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of trimethyl-p-benzoquinone
Assignee: BASF SE
•
Filing: 1969-08-05
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Granted: 1972-04-25
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Expires: 1989-08-05
Abstract
Abstract THE PRODUCTION OF TRIMETHYL-P-BENZOQUINONE BY OXIDATION OF 2,3,6-TRIMETHYLPHENOL IN THE PRESENCE OF A COBALT COMPLEX SALT AND AN AMIDE BEARING TWO SUBSTITUENTS ON THE NITROGEN ATOM. THE PRODUCT IS A VALUABLE STARTING MATERIAL FOR THE PRODUCTION OF PHARMACEUTICAL PRODUCTS.
Inventors
- 👤 Ludwig Schuster
- 👤 Horst Pommer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:27
CPC Classifications
C; C07; C07C; C07C46/00; C07C46/02; C07C46/06; C07C46/08
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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |