US3598823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tricyclic quinazolinones
Assignee: Sandoz AG
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Filing: 1969-05-28
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Granted: 1971-08-10
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Expires: 1989-05-28
Abstract
Abstract THE COMPOUNDS ARE BIOLOGICALLY ACTIVE TRICYCLIC QUINAZOLINONES OF THE CLASS OF IMIDAZO (2,1-B) QUINAZOLIN-5ONES, PYRIMIDO (2,1-B) QUINAZOLIN - 6 - ONES AND DIAZEPINO (2,1-B) QUINAZOLIN - 7 - ONES. PROCESSES FOR PREPARATION OF SAID COMPOUNDS INCLUDE THE REACTION OF A N-CARBOXY ANTHRANILIC ANHYDRIDE (AN ISATOIC ANHYDRIDE), OR AN ANTHRANILIC ACID WITH A CYCLIC PSEUDOTHIOUREA SUCH AS 2ORGANOMERCAPTO-4,5-DIHYDROIMIDAZOLE OR 2 - ORGANOMERCAPTO-3,4,5,6-TETRAHYDROPYRIMIDINE.
Inventors
- 👤 Goetz E Hardtmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:21
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/02; C07D487/04
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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |