Patent US3772305A successfully refreshed from Google Patents.
US3772305A
Expired / Lapsed
US
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3-amino-3-carbalkoxy-4-hydroxy-2-oxo-4-phenyl-1,2,3,4-tetrahydroquinolines
Assignee: F Hoffmann La Roche AG
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Filing: 1971-12-10
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Granted: 1973-11-13
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Expires: 1991-12-10
Abstract
Abstract PROCESS FOR THE PREPARATION OF BENZODIAZEPIN-2-ONES COMPRISING EFFECTING RING EXPANSION OF THE NOVEL 2-OXO-3AMINOQUINOLINE INTERMEDIATES VIA ACID OR HEAT TREATMENT. THE END PRODUCTS ARE USEFUL AS SEDATIVES, TRANQUILIZERS, ANTI-CONVULSANTS AND MUSCLE RELAXANTS.
Inventors
- 👤 J Hellerbach
- 👤 A Szente
- 👤 A Walser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:07
CPC Classifications
C; C07; C07D; C07D215/00; C07D215/02; C07D215/16; C07D215/48; C07D215/54; C07D215/56; C07C; C07C271/00; C07C271/06; C07C271/08; C07C271/10; C07C271/22
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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |