Patent US3590036A successfully refreshed from Google Patents.
US3590036A
Expired / Lapsed
US
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Naphthyridine-3-carboxylic acids,their derivatives and preparation thereof
Assignee: GEORGE Y LESHER
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Filing: 1968-11-18
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Granted: 1971-06-29
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Expires: 1988-11-18
Abstract
Abstract 1-SUBSTITUTED-1,4-DIHYDRO-4-OXO-1,8-NAPHTHYRIDINE3-CARBOXYLIC ACIDS AND DERIVATIVES, HAVING ANTIBACTERIAL, SEDATIVE AND STIMULATORY ACTIVITES, ARE PREPARED BY VARIOUS MEANS, E.G., BY REACTING THE CORRESPONDING 4-HYDROXY1,8-NAPHTHYRIDINE-3-CARBOXYLIC ACID OR DERIVATIVE WITH VARIOUS ALKYL OR SUBSTITUTED-ALKYL ESTERS OF A STRONG ACID.
Inventors
- 👤 George Y Lesher
- 👤 Monte D Gruett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:23
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/62; C07D213/63; C07D213/64; C07D213/24; C07D213/44; C07D213/46; C07D213/50; C07D213/61; C07D213/72; C07D213/73; C07D213/74; C07D213/76; C07D213/77; C07D213/78; C07D213/84; C07D213/85; C07D471/00; C07D471/02; C07D471/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |