Patent US4448962A successfully refreshed from Google Patents.
US4448962A
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US
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Substituted quinoline carboxylic acid derivatives
Assignee: Kyorin Pharmaceutical Co Ltd
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Filing: 1981-10-14
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Granted: 1984-05-15
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Expires: 2001-10-14
Abstract
Abstract This invention relates to new compounds of value as antibacterial agents. More particularly, it relates to quinoline carboxylic acid derivatives, the hydrates and the acid or alkali addition salts thereof.
Inventors
- 👤 Tsutomu Irikura
- 👤 Seigo Suzue
- 👤 Akira Ito
- 👤 Hiroshi Koga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:29
CPC Classifications
C; C07; C07D; C07D215/00; C07D215/02; C07D215/16; C07D215/48; C07D215/54; C07D215/56; A; A61; A61P; A61P31/00; A61P31/04; C07D471/00; C07D471/02; C07D471/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
11 words
1-Ethyl-1,4-dihydro-6-fluoro-7-(1-piperazinyl)-4-oxo-1,8-naphthyridine-3-carboxylic acid, the pharmacologically acceptable hydrates and acid addition salts thereof.
Claim 2
Dependent Claim
11 words
1-Ethyl-1,4-dihydro-6-fluoro-7-(1-piperazinyl)-4-oxo-1,8-naphthyridine-3-carboxylic acid, the pharmacologically acceptable hydrates and acid addition salts thereof.
Claim 3
Dependent Claim
3 words
1-Ethyl-1,4-dihydro-6-fluoro-7-(1-piperazinyl)-4-oxo-1,8-naphthyridine-3-carboxylic acid hydrochloride.
Claim 4
Dependent Claim
3 words
1-Ethyl-1,4-dihydro-6-fluoro-7-(1-piperazinyl)-4-oxo-1,8-naphthyridine-3-carboxylic acid hydrochloride.
Claim 5
Dependent Claim
2 words
1-Ethyl-7-(4-p-aminobenzyl-1-piperazinyl)-1,4-dihydro-6-fluoro-4-oxo-quinoline-3-carboxylic acid.
Claim 6
Dependent Claim
2 words
1-Ethyl-7-(4-p-aminobenzyl-1-piperazinyl)-1,4-dihydro-6-fluoro-4-oxo-quinoline-3-carboxylic acid.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |