US3852271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of 7-chloro-benzodiazepine derivatives
Assignee: Abbott GmbH and Co KG
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Filing: 1972-03-01
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Granted: 1974-12-03
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Expires: 1992-03-01
Abstract
Abstract Process for the preparation of 7-Cl benzodiazepine derivatives comprised in the general formula WHEREIN R H, CH3, R1 H, OH, OCOCH3 and the ring B may be substituted or unsubstituted, characterized in that a benzodiazepine of the formula WHEREIN R, R1 and B have the above indicated meanings, is chlorinated with elemental chlorine in the presence of nitrobenzene as the solvent.
Inventors
- 👤 A Ziggiotti
- 👤 F Mauri
- 👤 G Riva
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:00
CPC Classifications
C; C07; C07D; C07D243/00; C07D243/06; C07D243/10; C07D243/14; C07D243/16; C07D243/18; C07D243/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
11 words
A PROCESS FOR THE PREPARATION OF A 7-CHLOROBENZODIAZEPINE-2-ONE OF THE FORMULA
Claim 2
Dependent Claim
11 words
A PROCESS FOR THE PREPARATION OF A 7-CHLOROBENZODIAZEPINE-2-ONE OF THE FORMULA
References Cited (Backward Citations)
US3635948A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |