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Details for Patent: 4,474,787

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Summary for Patent: 4,474,787

Title: 7,6 Dioxo-4H,6H-pyrano[3,2-g]quinoline dicarboxylic acids and anti-allergic use thereof
Abstract:There are described compounds of formula I ##STR1## in which an adjacent pair of R.sub.5, R.sub.6, R.sub.7 and R.sub.8 form a chain --COCH.dbd.CE--O--, and the remainder of R.sub.5, R.sub.6, R.sub.7 and R.sub.8, which may be the same or different, each represent hydrogen, hydroxy, alkyl, halogen, alkenyl, alkoxy, or --NR.sub.1 R.sub.2 in which R.sub.1 and R.sub.2, which are the same or different, are each hydrogen or alkyl, Rg is hydrogen, alkyl, alkenyl or phenyl-alkyl, and E is --COOH, a 5-tetrazolyl group or an (N-tetrazol-5-yl) carboxamido group, and pharmaceutically acceptable derivatives thereof. There are also described processes for making the compounds and pharmaceutical, e.g. anti-allergic, compositions containing the compounds.
Inventor(s): Cairns; Hugh (Loughborough, GB2), Cox; David (Loughborough, GB2)
Assignee: Fisons Limited (GB2)
Application Number:06/344,982
Patent Claim Types:
see list of patent claims
Compound; Use; Composition; Dosage form;

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Foreign Priority and PCT Information for Patent: 4,474,787

Foriegn Application Priority Data
Foreign Country Foreign Patent Number Foreign Patent Date
United Kingdom18597/77May 04, 1977
United Kingdom48565/77Nov 04, 1977
United Kingdom16168/78Apr 25, 1978

International Patent Family for Patent: 4,474,787

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Australia3573178► subscribe
Australia520816► subscribe
Belgium866622► subscribe
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The estimated expiration dates shown above are derived by simply adding 20 years to the priority date.
Due to the complexity of determining patent expirations even in a single country, compounded by the diversity of global patent laws, it is advisable to have patent counsel verify freedom to operate.

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