Patent DE669728C successfully refreshed from Google Patents.
US3769286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trialkoxy quinazolines
Assignee: Pfizer Inc
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Filing: 1972-04-03
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Granted: 1973-10-30
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Expires: 1992-04-03
Abstract
Abstract A SERIES OF NOVEL 2-SUBSTITUTED-4-AMINO-6,7,8-TRIALKOXYQUINAZOLINES HAVE BEEN PREPARED, INCLUDING THEIR ACID ADDITION SALTS. THESE COMPOUNDS ARE USEFUL IN THERAPY AS POTENT ANTIHYPERTENSIVE AGENTS. METHODS FOR THEIR PREPARATION ARE DESCRIBED IN DETAIL, INCLUDING VARIOUS SYNTHETIC ROUTES LEADING TO THE REQUIRED NOVEL INTERMEDIATES.
Inventors
- 👤 H Hess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:45
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/70; C07D239/72; C07D239/95; C07D239/96
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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |