US3703546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of 3-amino-2,5-dichlorobenzoic acid
Assignee: Rhone Poulenc Nederland BV
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Filing: 1968-10-24
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Granted: 1972-11-21
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Expires: 1988-10-24
Abstract
Abstract 3-AMINO-2,5-DICHLOROBENZOIC ACID IS PREPARED IN HIGH YIELD BY CHLORINATING BENZOYLCHLORIDE AND ESTERIFYING THE RESULTING MIXTURE, SEPARATING THE DESIRED 2,5-DICHLORO ISOMER FROM THE MIXTURE BY FREEZE CRYSTALLIZATION, NITRATING AND ISOLATING 3-NITRO-2,5-DICHLOROBENZOIC ACID FROM THE MIXTURE OF NITRO ISOMERS BY ACID HYDROLYSIS AND TREATING WITH A REDUCING AGENT.
Inventors
- 👤 Joseph Michael Faraday Leaper
- 👤 Harvey Peter John Raman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:46
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/14; C07C201/00; C07C201/06; C07C201/08; C07C201/16
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) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |