US3211731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyrazolo-pyrimidines and process for preparing same
Assignee: BASF Corp
•
Filing: 1961-05-05
•
Granted: 1965-10-12
•
Expires: 1981-05-05
Abstract
No abstract record available.
Inventors
- 👤 Schmidt Paul
- 👤 Eichenberger Kurt
- 👤 Wilhelm Max
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:17
CPC Classifications
C; C07; C07D; C07D231/00; C07D231/02; C07D231/10; C07D231/14; C07D231/38; C07D401/00; C07D401/02; C07D401/04; C07D487/00; C07D487/02; C07D487/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
11 words
A MEMBER SELECTED FROM THE GROUP OF PYRAZOLO(3,4D)-PYRIMIDINES OF THE FORMULA
Claim 2
Dependent Claim
11 words
A MEMBER SELECTED FROM THE GROUP OF PYRAZOLO(3,4D)-PYRIMIDINES OF THE FORMULA
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
US3004025A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-11 | 1969-04-12 | 1969-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-11 | 1973-04-12 | 1973-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-11 | 1977-04-12 | 1977-10-12 | $7700.00 | Window Closed / Lapsed |