US4065457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
4-Hydroxy-3-nitro-carbostyril compounds
Assignee: Beecham Group PLC
•
Filing: 1976-08-18
•
Granted: 1977-12-27
•
Expires: 1996-08-18
Abstract
Abstract A class of 4-hydroxy-3-nitrocarbostyril derivatives are useful in the inhibition of certain types of antigen antibody reactions.
Inventors
- 👤 Derek Richard Buckle
- 👤 Barrie Christian Charles Cantello
- 👤 Harry Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:59
CPC Classifications
C; C07; C07D; C07D215/00; C07D215/02; C07D215/16; C07D215/20; C07D215/22; C07D215/24; C07D215/26; C07D221/00; C07D221/02; C07D221/04; C07D221/06; C07D221/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
48 words
A compound of the formula (IA) or a pharmaceutically acceptable salt thereof: ##STR6## wherein one of the groups R 6 , R 7 and R 8 are hydrogen and the other two are methyl, ethyl, n-propyl, methoxy, ethoxy or n-propoxy, and R 9 is hydrogen or lower alkyl.
Claim 2
Dependent Claim
48 words
A compound of the formula (IA) or a pharmaceutically acceptable salt thereof: ##STR6## wherein one of the groups R 6 , R 7 and R 8 are hydrogen and the other two are methyl, ethyl, n-propyl, methoxy, ethoxy or n-propoxy, and R 9 is hydrogen or lower alkyl.
Claim 3
Dependent Claim
9 words
The compound 6,7-dimethyl-4-hydroxy-3-nitro-carbostyril or a pharmaceutically acceptable salt thereof.
Claim 4
Dependent Claim
9 words
The compound 6,7-dimethyl-4-hydroxy-3-nitro-carbostyril or a pharmaceutically acceptable salt thereof.
Claim 5
Dependent Claim
9 words
The compound 1,6,7-trimethyl-4-hydroxy-3-nitro-carbostyril or a pharmaceutically acceptable salt thereof.
Claim 6
Dependent Claim
9 words
The compound 1,6,7-trimethyl-4-hydroxy-3-nitro-carbostyril or a pharmaceutically acceptable salt thereof.
Claim 7
Dependent Claim
9 words
The compound 6,7-diethyl-4-hydroxy-3-nitro-carbostyril or a pharmaceutically acceptable salt thereof.
Claim 8
Dependent Claim
9 words
The compound 6,7-diethyl-4-hydroxy-3-nitro-carbostyril or a pharmaceutically acceptable salt thereof.
Claim 9
Dependent Claim
9 words
The compound 7,8-dimethyl-4-hydroxy-3-nitro-carbostyril or a pharmaceutically acceptable salt thereof.
Claim 10
Dependent Claim
9 words
The compound 7,8-dimethyl-4-hydroxy-3-nitro-carbostyril or a pharmaceutically acceptable salt thereof.
Claim 11
Dependent Claim
9 words
The compound 8-methyl-4-hydroxy-3-nitro-carbostyril or a pharmaceutically acceptable salt thereof.
Claim 12
Dependent Claim
9 words
The compound 8-methyl-4-hydroxy-3-nitro-carbostyril or a pharmaceutically acceptable salt thereof.
References Cited (Backward Citations)
US3025299A
Cited
GB326398A
Cited
AT205502B
Cited
US3355278A
Cited
US3271403A
Cited
FR2009119A1
Cited
US3836657A
Cited
FR2229414A1
Cited
US4006237A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-26 | 1981-06-27 | 1981-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-26 | 1985-06-27 | 1985-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-26 | 1989-06-27 | 1989-12-27 | $7700.00 | Window Closed / Lapsed |