US4189433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
4-Hydroxy-1,2-benzisothiazoles and their manufacture
Assignee: BASF SE
•
Filing: 1978-01-23
•
Granted: 1980-02-19
•
Expires: 1998-01-23
Abstract
Abstract The new compound 4-hydroxy-1,2-benzisothiazole and its derivatives, and their manufacture. The products are intermediates for new drugs which are useful in cardiac and circulatory disorders.
Inventors
- 👤 Ulrich Ohnsorge
- 👤 Helmut Hagen
- 👤 Fritz-Frieder Frickel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:37
CPC Classifications
C; C07; C07D; C07D275/00; C07D275/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
53 words
1,2-benzisothiazoles of the formula (I) ##STR14## where R 1 is hydrogen, amino, which is unsubstituted or substituted by the acyl radical of a carboxylic acid of 1 to 4 carbon atoms, or nitro, and where R is hydrogen, benzyl, or the acyl radical of a carboxylic acid of 1 to 4 carbon atoms.
Claim 2
Dependent Claim
53 words
1,2-benzisothiazoles of the formula (I) ##STR14## where R 1 is hydrogen, amino, which is unsubstituted or substituted by the acyl radical of a carboxylic acid of 1 to 4 carbon atoms, or nitro, and where R is hydrogen, benzyl, or the acyl radical of a carboxylic acid of 1 to 4 carbon atoms.
Claim 3
Dependent Claim
1 words
4-Hydroxy-1,2-benzisothiazole.
Claim 4
Dependent Claim
1 words
4-Hydroxy-1,2-benzisothiazole.
Claim 5
Dependent Claim
1 words
7-Nitro-4-hydroxy-1,2-benzisothiazole.
Claim 6
Dependent Claim
1 words
7-Nitro-4-hydroxy-1,2-benzisothiazole.
Claim 7
Dependent Claim
1 words
7-Amino-4-hydroxy-1,2-benzisothiazole.
Claim 8
Dependent Claim
1 words
7-Amino-4-hydroxy-1,2-benzisothiazole.
Claim 9
Dependent Claim
1 words
7-Acetamino-4-hydroxy-1,2-benzisothiazole.
Claim 10
Dependent Claim
1 words
7-Acetamino-4-hydroxy-1,2-benzisothiazole.
Claim 11
Dependent Claim
15 words
A 1,2-benzisothiazole as set forth in claim 1, wherein the carboxylic acid is acetic acid.
References Cited (Backward Citations)
GB1058822A
Cited
US3997548A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-18 | 1983-08-20 | 1984-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-18 | 1987-08-20 | 1988-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-18 | 1991-08-20 | 1992-02-19 | $7700.00 | Window Closed / Lapsed |