US3580925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Imidazole preparation
Assignee: EIDP Inc
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Filing: 1968-12-26
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Granted: 1971-05-25
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Expires: 1988-12-26
Abstract
Abstract THE PREPARATION OF BENZILS FROM BENZOINS BY REACTING THE BENZOIN WITH A CUPRIC CARBOXYLATE CATALYST IN THE PRESENCE OF A SOLVENT OF ACETIC ACID OR A WATER-MISCIBLE ALCOHOL AT A TEMPERATURE OF 2-0* TO 130*C. WHILE PASSING OXYGEN INTO THE REACTION MIXTURE. THE PREPARATION OF IMIDAZOLES FROM BENZILS BY ADDING, TO THE REACTION MIXTURE IN THE PRECEDING SENTENCE, AMMONIA OR A WEAK ACID SALT THEREOF AND A BENZALDEHYDE.
Inventors
- 👤 Philip Manos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:24
CPC Classifications
C; C07; C07D; C07D233/00; C07D233/54; C07D233/64; C07C; C07C45/00; C07C45/27; C07C45/32; C07C45/37; C07C45/39
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |