Patent US3635948A successfully refreshed from Google Patents.
US3635948A
Expired / Lapsed
US
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Preparation of 7 - chloro-2 2-dihydro-1-methyl-5-phenyl - 1h -1 4-benzodiazepine from 2 3 -dihydro-1-methyl-5-phenyl-1h-1 4-benzodiazepine by chlorination
Assignee: F Hoffmann La Roche AG
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Filing: 1968-06-04
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Granted: 1972-01-18
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Expires: 1988-06-04
Abstract
Abstract 7 - CHLORO-2,3-DIHYDRO-1-METHYL-5-PHENYL-1H-1,4-BENZODIAZEPINE (A) FROM 2,3-DIHYDRO-1-METHYL-5-PHENYL-1H-1,4BENZODIAZEPINE BY CHLORINATION. (A) IS USEFUL AS AN ANTICONVULSANT, MUSCLE RELAXANT AND SEDATIVE AGENT.
Inventors
- 👤 Robert Ye-Fong Ning
- 👤 Leo Henryk Sternbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:30
CPC Classifications
C; C07; C07D; C07D243/00; C07D243/06; C07D243/10; C07D243/14; C07D243/16
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |