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Serving leading biopharmaceutical companies globally:

Boehringer Ingelheim
Argus Health

Generated: December 12, 2017

DrugPatentWatch Database Preview

Details for Patent: 5,541,171

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Summary for Patent: 5,541,171

Title: Orally administrable pharmaceutical composition
Abstract:A solid dosage form, such as a capsule or tablet, containing a pharmacologically active agent is coated with an anionic polymer, which is insoluble in gastric juice and in intestinal juice below pH7 but soluble in colonic intestinal juice, in a sufficient amount that the oral dosage form remains intact until it reaches the colon. The preferred anionic polymer is a partly methyl esterified methacrylic acid polymer in which the ratio of free carboxylic groups to ester groups is about 1:2. The invention has particular application to dosage forms of prednisolone and salts thereof, indomethacin, ibuprofen, and, especially, 5-amino-salicylic acid.
Inventor(s): Rhodes; John (Cardiff, GB7), Evans; Brian K. (Dinas Powis, GB7)
Assignee: Tillotts Pharma AG (Ziefen, CH)
Application Number:08/448,300
Patent Claim Types:
see list of patent claims
Use; Composition; Compound; Dosage form;

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Foreign Priority and PCT Information for Patent: 5,541,171

Foriegn Application Priority Data
Foreign Country Foreign Patent Number Foreign Patent Date
United Kingdom8123573Jul 31, 1981

International Patent Family for Patent: 5,541,171

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Finland85216► Subscribe
Germany3268277► Subscribe
Canada1172570► Subscribe
Denmark128283► Subscribe
Denmark158931► Subscribe
European Patent Office0097651► Subscribe
Finland833099► Subscribe
Australia551173► Subscribe
Australia8732482► Subscribe
Austria17189► 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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Serving leading biopharmaceutical companies globally:

Fish and Richardson
Argus Health
Queensland Health

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