Patent US3790577A successfully refreshed from Google Patents.
US3790577A
Expired / Lapsed
US
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Pyridoquinoline dicarboxylic acid derivatives
Assignee: Imperial Chemical Industries Ltd
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Filing: 1971-09-13
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Granted: 1974-02-05
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Expires: 1991-09-13
Abstract
Abstract DICARBOXYLIC ACID DERIVATIVES OF 1,7-PHENANTHROLINE, 4,7-PHENANTHROLINE, PYRIDO(2,3-G)QUINOLINE AND PYRIDO(3,2,-G)QUINOLINE, PROCESS FOR THEIR PREPARATION, AND PHARMACEUTICAL COMPOSITIONS. A REPRESENTATIVE COMPOUND IS 2,8-DIETHOXYCARBONYL-4,10-DIHYDROXY-6 METHYL- 1,7PHENANTHROLINE. COMPOUNDS ACTIVE AGAINST SYNDROMES OR DISEASES INITIATED BY AN ANTIGEN-ANTIBODY REACTION.
Inventors
- 👤 W Waring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:13
CPC Classifications
C; C07; C07D; C07D471/00; C07D471/02; C07D471/04; C07C; C07C205/00; C07C205/06
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |