US3575976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
3-amino-1,2,8,9-tetraazaphenalenes
Assignee: Novartis Corp
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Filing: 1969-03-24
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Granted: 1971-04-20
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Expires: 1989-03-24
Abstract
Abstract 3-AMINO-1,2,8,9-TETRAAZAPHENALENES OPTIONALLY SUBSTITUTED IN THE 4, 5, 6, 7 AND/OR 9 POSITIONS AND THEIR SALTS ARE CARDIOVASCULAR AGENTS AND CAN BE PREPARED FROM THE CORRESPONDING 1,2,8,9-TETRAAZAPHENALENES. REPRESENTATIVE EMBODIMENTS ARE 3-AMINO-1,2,8,9-TETRAAZAPHENALENE AND 3-BENZYLAMINO-9-PHENYL-1,2,8,9-TETRAAZAPHENALENE.
Inventors
- 👤 Karl J Doebel
- 👤 John E Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:16
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/02; C07D487/06
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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |