Patent US3577441A successfully refreshed from Google Patents.
US3577441A
Expired / Lapsed
US
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Nitro substituted benzofurans
Assignee: Warner Lambert Co LLC
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Filing: 1967-03-07
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Granted: 1971-05-04
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Expires: 1987-03-07
Abstract
Abstract A NOVEL METHOD FOR THE PRODUCTION OF SUBSTITUTED BENZOFURANS BY REACTING AN ACTIVATED HALO COMPOUND WITH AN OXIME IN THE PRESENCE OF A SUITABLE BASE TO OBTAIN AN OXIME ETHER. THE OXIME ETHER IS THEN TREATED TO YIELD THE BENZOFURAN NUCELUS.
Inventors
- 👤 Daniel Kaminsky
- 👤 Robert I Meltzer
- 👤 John Shavel Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:55
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; C07D307/78; C07D307/79; C07D211/00; C07D211/04; C07D211/68; C07D211/72; C07D307/80; C07D307/91; C07D307/93
Claims Analysis
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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) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |