US3920652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic substituted pyrazola {8 1,5a{9 {0 pyrimidine compounds useful as xanthine oxidase inhibitors
Assignee: Viratek Inc
•
Filing: 1972-06-08
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Granted: 1975-11-18
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Expires: 1992-06-08
Abstract
Abstract Compounds of the following structure are disclosed which are effective inhibitors of the enzyme xanthine oxidase: R is an aromatic or substituted aromatic nucleus such as phenyl, R1 is H, an alkali metal or ammonium, and R2 is H or OR1.
Inventors
- 👤 Robert H Springer
- 👤 Darrell E O'brien
- 👤 Lionel N Simon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:58
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/33; A61K31/395; A61K31/495; A61K31/505; C; C07; C07D; C07D487/00; C07D487/02; C07D487/04
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
10 words
The compound of claim 1 in which R is phenyl.
Claim 4
Dependent Claim
9 words
The compound of claim 1 in which R is
Claim 5
Dependent Claim
9 words
The compound of claim 1 in which R is
Claim 6
Dependent Claim
9 words
The compound of claim 1 in which R is
Claim 7
Dependent Claim
9 words
The compound of claim 1 in which R is
Claim 8
Dependent Claim
10 words
The compound of claim 3 in which R3 is Cl.
Claim 9
Dependent Claim
10 words
The compound of claim 3 in which R3 is Br.
Claim 10
Dependent Claim
1 words
3-phenylpyrazolo(1,5a)pyrimidine-5,7-diol.
Claim 11
Dependent Claim
1 words
3-phenylpyrazolo(1,5a)pyrimidine-5,7-diol.
Claim 12
Dependent Claim
1 words
3-(m-tolyl)pyrazolo(1,5a)pyrimidine-5,7-diol.
Claim 13
Dependent Claim
1 words
3-(m-tolyl)pyrazolo(1,5a)pyrimidine-5,7-diol.
Claim 14
Dependent Claim
1 words
3-(p-bromophenyl)pyrazolo(1,5a)pyrimidine-5,7-diol.
Claim 15
Dependent Claim
1 words
3-(p-bromophenyl)pyrazolo(1,5a)pyrimidine-5,7-diol.
Claim 16
Dependent Claim
1 words
3-piperonylpyrazolo(1,5a)pyrimidine-5,7-diol.
Claim 17
Dependent Claim
1 words
3-piperonylpyrazolo(1,5a)pyrimidine-5,7-diol.
Claim 18
Dependent Claim
1 words
3-(m-tolyl)pyrazolo(1,5a)pyrimidine-7-ol.
Claim 19
Dependent Claim
1 words
3-(m-tolyl)pyrazolo(1,5a)pyrimidine-7-ol.
Claim 20
Dependent Claim
1 words
3-phenylpyrazolo(1,5a)pyrimidine-7-ol.
Claim 21
Dependent Claim
1 words
3-phenylpyrazolo(1,5a)pyrimidine-7-ol.
Claim 22
Dependent Claim
4 words
3-(3''-pyridyl) pyrazolo (1,5a) pyrimidine-5,7-diol
Claim 23
Dependent Claim
4 words
3-(3''-pyridyl) pyrazolo (1,5a) pyrimidine-5,7-diol
References Cited (Backward Citations)
US3048587A
Cited
US3296268A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |