US3657265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing benzoxazolones from aromatic nitro compounds
Assignee: Olin Corp
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Filing: 1968-06-21
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Granted: 1972-04-18
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Expires: 1988-06-21
Abstract
Abstract THE PROCESS FOR PREPARING BENZOXAZOLONES BY REACTING AN AROMATIC NITRO COMPUND, IN WHICH AT LEAST ONE OF THE TWO ORTHO POSITIONS IS UNSUBSTITUTED, WITH CARBON MONOXIDE AND CARBON DIOXIDE IN THE PRESENCE OF A CAYALYST AND RECOVERING THE BENZOXZOLONES PRODUCED THEREBY. THE CATALYST MAY BE A MIXTURE OF A HALIDE OF AN OXIDE OF PALLADIUM OR RHODIUM WITH AN OXIDE OF AN ELEMENT SELECTED FROM THE GROUP CONSISTING OF VANADIUM, MOLYBDENUM, TUNSTEN, NIOBIUM, CHROMIUM AND TANTALUM.
Inventors
- 👤 Ehrenfried H Kober
- 👤 Philip D Hammond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:53
CPC Classifications
C; C07; C07D; C07D263/00; C07D263/52; C07D263/54; C07D263/58
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) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |