US3563990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
1-substituted-4-aryl-2(1h)-quinazolinones
Assignee: Sandoz AG
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Filing: 1969-03-18
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Granted: 1971-02-16
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Expires: 1989-03-18
Abstract
Abstract THE INVENTION DISCLOSES PREPARATION OF 1-SUBSTITUTED-4ARYL-2(1H)-QUINAZOLINONES FROM THEIR CORRESPONDING 1SUBSTITUTED-4ARYL - 5,6,7,8 - TETRAHYDRO-2(1H)-QUINAZOLINONES.
Inventors
- 👤 Goetz E Hardtmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:53
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/70; C07D239/72; C07D239/78; C07D239/80; C07D239/82
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |