Patent US4691016A successfully refreshed from Google Patents.
US4691016A
Expired / Lapsed
US
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Intermediates for the preparation of 8,9-dihalobenzo[ij]quinolizine carboxylic acids
Assignee: Riker Laboratories Inc
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Filing: 1985-08-22
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Granted: 1987-09-01
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Expires: 2005-08-22
Abstract
Abstract The compounds 8-bromo-6,7-dihydro-9-fluoro-5-methyl-1-oxo-1H,5H-benzo[ij]quinolizine-2-carboxylic acid and 8-chloro-6,7-dihydro-9-fluoro-5-methyl-1-oxo-1H,5H-benzo[ij]quinolizine-2-carboxylic acid are disclosed as potent antimicrobials. Pharmaceutically-acceptable carboxylate salts, acyl chlorides, esters and alkylaminoalkyl ester salts of the acids are also disclosed.
Inventors
- 👤 Richard M. Stern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:45
CPC Classifications
C; C07; C07D; C07D455/00; C07D455/03; C07D455/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
4 words
The compound 8-amino-6,7-dihydro-9-fluoro-5-methyl-1-oxo-1H,5H-benzo[ij]quinolizine-2-carboxylic acid.
Claim 2
Dependent Claim
4 words
The compound 8-amino-6,7-dihydro-9-fluoro-5-methyl-1-oxo-1H,5H-benzo[ij]quinolizine-2-carboxylic acid.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-31 | 1991-03-02 | 1991-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-31 | 1995-03-02 | 1995-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-31 | 1999-03-02 | 1999-09-01 | $7700.00 | Window Closed / Lapsed |