Patent US1683371A successfully refreshed from Google Patents.
Patent US3907799A successfully refreshed from Google Patents.
US3907799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Xanthine oxidase inhibitors
Assignee: Viratek Inc
•
Filing: 1974-02-11
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Granted: 1975-09-23
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Expires: 1994-02-11
Abstract
Abstract Compounds of the following structure are disclosed which are effective inhibitors of the enzyme xanthine oxidase: IN WHICH Y1 and Y2 are C or N; R1 is H or an alkali metal or ammonium; R2 is H, CH3, a halogen, phenylazo or NO2; R3 is OR1, H, or a halogen; AND R4 is H, NO2 or a halogen. When Y1 is C, Y2 is N and when Y1 is N, Y2 is C.
Inventors
- 👤 Darrell E O'brien
- 👤 Roland K Robins
- 👤 Lionel N Simon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:48
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/02; C07D487/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
5 words
A COMPOUND OF THE STRUCTURE
Claim 2
Dependent Claim
5 words
A COMPOUND OF THE STRUCTURE
Claim 3
Dependent Claim
25 words
The compound of claim 1 in which Y1 is C and Y2 is N, and R1, R2 and R4 are H and R3 is OH.
Claim 4
Dependent Claim
25 words
The compound of claim 1 in which Y1 is C and Y2 is N, and R1, R2 and R4 are H and R3 is Cl.
Claim 5
Dependent Claim
27 words
The compound of claim 1 in which Y1 is C and Y2 is N, and R1 and R2 are H, R3 is OH and X is NO2.
Claim 6
Dependent Claim
27 words
The compound of claim 1 in which Y1 is C and Y2 is N, and R1 and R2 are H, R3 is OH and R4 is Cl.
Claim 7
Dependent Claim
27 words
The compound of claim 1 in which Y1 is C and Y2 is N, and R1 and R2 are H, R3 Is OH and X is Br.
Claim 8
Dependent Claim
25 words
The compound of claim 1 in which Y1 is N and Y2 is C, and R1, R2, and R4 are H, and R3 is OH.
Claim 9
Dependent Claim
28 words
The compound of claim 1 in which Y1 is N and Y2 is C, and R1 and R4 are H, and R2 is CH3 and R3 is OH.
Claim 10
Dependent Claim
27 words
The compound of claim 1 in which Y1 is N and Y2 is C, and R1 and R4 are H, R2 is Br and R3 is OH.
Claim 11
Dependent Claim
27 words
The compound of claim 1 in which Y1 is N and Y2 is C, and R1 and R4 are H, R2 is NO2 and R3 is OH.
References Cited (Backward Citations)
US2553500A
Cited
US3244717A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |