US3592748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of quinones
Assignee: F Hoffmann La Roche AG
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Filing: 1970-04-13
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Granted: 1971-07-13
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Expires: 1990-04-13
Abstract
Abstract PREPARATION OF QUINONES AND NAPHTHOQUINONES FROM PHENOLS OR NAPHTHOLS BY SUBJECTING AN AQUEOUS SOLUTION CONTAINING THE PHENOL OR THE NAPHTHOL AND A HYDROXYLAMINE DISULFONATE TO ELECTROLYSIS.
Inventors
- 👤 Pius A Wehrli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:34
CPC Classifications
C; C25; C25B; C25B3/00; C25B3/20; C25B3/23; C25B3/01; C25B3/07
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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |