US3642797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
4h-pyrido(1 2-a)pyrimidin-4-ones
Assignee: STWB Inc
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Filing: 1968-06-10
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Granted: 1972-02-15
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Expires: 1988-06-10
Abstract
Abstract 4H-PYRIDO(1,2-A)PYRIMIDIN-4-ONES, WHICH CAN BE SUBSTITUTED AT POSITION 6, 7, 8, OR 9 OF THE PYRIDOPYRIMIDINE NUCLEUS BY A SUBSTITUENT SELECTED FROM THE GROUP CONSISTING OF HYDROXY, LOWER-ALKANOYLAMINO, LOWER ALKYLAMINO, BENZYL, LOWER-ALKOXY, LOWER-ALKYLMERCAPTO, LOWER-ALKYLSULFINYL, LOWER-ALKYLSULFONYL AND TRIHALOMETHYL. THE COMPOUNDS ARE USED AS ANTI-INFLAMMATORY AGENTS.
Inventors
- 👤 George Y Lesher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:20
CPC Classifications
C; C07; C07D; C07D319/00; C07D319/04; C07D319/06; C07D471/00; C07D471/02; C07D471/04
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) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |