US4026893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyrazolo{8 1,5-a{9 pyrido{8 3,2-e{9 pyrimidine-7-carboxylic acid derivatives
Assignee: ER Squibb and Sons LLC
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Filing: 1975-11-07
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Granted: 1977-05-31
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Expires: 1995-11-07
Abstract
Abstract New derivatives of pyrazolo[1,5-a]pyrido[3,2-e]-pyrimidine-7-carboxylic acid have the general formula <IMAGE> The new compounds are useful as central nervous system depressants and as anti-inflammatory agents.
Inventors
- 👤 Theodor Denzel
- 👤 Hans Hoehn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:34
CPC Classifications
C; C07; C07D; C07D471/00; C07D471/12; C07D471/14; A; A61; A61P; A61P25/00; A61P29/00; C07D487/00; C07D487/02; C07D487/04
Claims Analysis
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References Cited (Backward Citations)
US3313815A
Cited
US3329679A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |