Patent US3786071A successfully refreshed from Google Patents.
US3786071A
Expired / Lapsed
US
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Chemical compounds chromone-2-carboxylic acids
Assignee: Fisons Ltd
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Filing: 1971-08-16
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Granted: 1974-01-15
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Expires: 1991-08-16
Abstract
Abstract THERE ARE DDESCRIBED CERTAIN MONO-CHROMONE-2-CARBOXYLIC ACIDS OF FORMULA, 2-(HOOC-),4-(O=),5-R5,6-R6,7-R7,8-R8-4H-CHROMENE HAVING ONE SUBSTITUENT IN THE 5 OR 6 POSITION OR HAVING 2 OR MORE SUBSTITUENTS IN THE 5, 6, 7 OR 8 POSITIONS. THERE ARE ALSO DESCRIBED PROCESSES FOR MAKING THE COMPOUNDS AND PHARMACEUTICAL COMPOSITIONS, FOR THE TREATMENT OF ASTHMA, CONTAINING THE COMPOUNDS.
Inventors
- 👤 H Cairns
- 👤 A Chambers
- 👤 T Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:01
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/04; C07D311/22; C07D311/24; C07C; C07C45/00; C07C45/61; C07C45/67; C07C45/68; C07C45/70; C07C45/71; C07C59/00; C07C59/40; C07C59/58; C07C59/64; C07C59/66; C07C59/68; C07D307/00; C07D307/02; C07D307/04; C07D307/10; C07D307/12
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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |