Patent US3663706A successfully refreshed from Google Patents.
US3663706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of 2,4-diaminoquinazolines as hypotensive agents
Assignee: PFIZER PHARMACEUCIALS Inc
•
Filing: 1969-09-29
•
Granted: 1972-05-16
•
Expires: 1989-09-29
Abstract
Abstract NOVEL 2,4-DIAMINOQUINAZOLINES WHEREIN AT LEAST ONE OF THE 6-OR 7-POSITIONS IS SUBSTITUTED WITH ALKOXY HAVING FROM 1 TO 3 CARBON ATOMS AND ACID ADDITION SALTS THEREOF, THE PREPARATION THEREOF AND THE UTILITY THEREOF AS HYPOTENSIVE AGENTS.
Inventors
- 👤 Hans-Jurgen E Hess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:01
CPC Classifications
C; C07; C07D; C07D405/00; C07D405/14; A; A61; A61K; A61K31/00; A61K31/33; A61K31/395; A61K31/495; A61K31/505; C07D239/00; C07D239/70; C07D239/72; C07D239/95
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |