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Details for Patent: 5,344,658

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Summary for Patent: 5,344,658

Title: Process and composition using ondansetron
Abstract:The invention relates to a process for reducing the crystal size of ondansetron hydrochloride dihydrate produced by crystallisation from solvent to a size which is suitable for effective distribution in a tablet blend, in particular 100% less that 250 .mu.m. The ondansetron hydrochloride dihydrate is desolvated by drying at elevated temperature and reduced or atmospheric pressure and is then rehydrated.
Inventor(s): Collin; David T. (Ware, GB2)
Assignee: Glaxo Group Limited (London, GB2)
Application Number:08/005,736
Patent Claim Types:
see list of patent claims
Compound; Dosage form; Process; Composition;

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Foreign Priority and PCT Information for Patent: 5,344,658

Foriegn Application Priority Data
Foreign Country Foreign Patent Number Foreign Patent Date
United Kingdom89148043Jun 28, 1989

International Patent Family for Patent: 5,344,658

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Canada2019944► subscribe
Germany69011786► subscribe
Denmark0415522► 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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