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Details for Patent: 5,631,021

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Summary for Patent: 5,631,021

Title: Method for producing microcapsule
Abstract:A microcapsule produced by preparing a water-in-oil emulsion comprising an inner aqueous layer containing said water-soluble drug and a drug retaining substance therefor and an oil layer containing a polymer substance, then thickening or solidifying said inner aqueous layer to a viscosity of not lower than about 5000 centiposes and finally subjecting the resulting emulsion to in water drying gives prolonged release of water-soluble drug.
Inventor(s): Okada; Hiroaki (Osaka, JP), Ogawa; Yasuaki (Osaka, JP), Yashiki; Takatsuka (Hyogo, JP)
Assignee: Takeda Chemical Industries, Ltd. (Osaka, JP)
Application Number:08/604,022
Patent Claim Types:
see list of patent claims
Composition; Compound; Dosage form;
Patent PDF download available with subscription

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Premature patent expiration for: 5,631,021

Expiration due to failure to pay maintenance fee

Patent Number Expiration Date
5,631,021 May 20, 2005

Foreign Priority and PCT Information for Patent: 5,631,021

Foriegn Application Priority Data
Foreign Country Foreign Patent Number Foreign Patent Date
Japan58-207760Nov 04, 1983

International Patent Family for Patent: 5,631,021

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Austria42197<disabled in preview>
Bulgaria60493<disabled in preview>
Canada1233414<disabled in preview>
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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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