Patent US3816545A successfully refreshed from Google Patents.
US3816545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydroxylation of aromatic compounds
Assignee: Universal Oil Products Co
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Filing: 1971-02-16
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Granted: 1974-06-11
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Expires: 1991-02-16
Abstract
Abstract AN IMPROVED PROCESS FOR THE HYDROXYLATION OF AN AROMATIC COMPOUND IS EFFECTED BY TREATING AN AROMATIC COMPOUND WITH HYDROGEN PEROXIDE IN THE PRESENCE OF A CATALYST COMPRISING HYDROGEN FLUORIDE AND ALSO IN THE PRESENCE OF A CATALYST MODIFIER COMPRISING AN ORGANOSULFONIC ACID.
Inventors
- 👤 H Bloch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:21
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/60
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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |