US3767679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
3-substituted chromones
Assignee: Warner Lambert Co LLC
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Filing: 1971-09-13
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Granted: 1973-10-23
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Expires: 1991-09-13
Abstract
Abstract 3-SUBSTITUTED CHROMONES HAVING THE FOLLOWING STRUCTURAL FORMULAS ARE DISCLOSED. 3-(R1-CH2-),4-(O=),R2-4H-CHROMENE, OR ((4-(O=),R2-4H- CHROMEN-3-YL)-CH2)2-R3 WHEREIN R1 IS HALOGEN, CYANO, CARBOXY, CARBOXAMIDE, AMINO, ALKYLAMINO, ARYLAMINO, ALKOXY, N-ALKYLHYDROXYLAMINO, ACYLOXY, AMIDO AND IMIDO; R2 IS HYDROGEN, HALOGEN, LOWER ALKOXY; AND R3 IS AMINO, ALKYLENDIAMINO SUCH AS ETHYLENEDIAMINO, ETC., CYCLIC DIAMINO SUCH AS PIPERAZINE-1,4-DIYL-HYDROXYLAMINO, -O- OR -S-. THEY ARE USEFUL IN PREVENTING ALLERGIC MANIFESTATIONS. COMPOUNDS OF THIS TYPE ARE PREPARED FROM 3-(HYDROXYMETHYL)CHROMONES.
Inventors
- 👤 Strandtmann M Von
- 👤 S Klutchko
- 👤 J Shavel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:58
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/04; C07D311/22
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |