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Generated: November 19, 2017

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Details for Patent: 5,575,987

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Summary for Patent: 5,575,987

Title: Method of producing sustained-release microcapsules
Abstract:A method of producing sustained-release microcapsules containing a biologically active substance from an W/O emulsion comprising an inner aqueous phase containing said biologically active substance and an external oil phase containing a biodegradable polymer, characterized in that microcapsules formed on microencapsulation of said biologically active substance with said biodegradable polymer are heated at a temperature not lower than the glass transition temperature of said biodegradable polymer but not so high as to cause aggregation of the microcapsules. This method enables the production of very useful sustained release microcapsules adapted to release a bologically active substance at a calculated rate over a protracted time period starting immediately following administration without an initial burst within one day following administration.
Inventor(s): Kamei; Shigeru (Takarazuka, JP), Yamada; Minoru (Kawanishi, JP), Ogawa; Yasuaki (Ohyamazaki-cho, JP)
Assignee: Takeda Chemical Industries, Ltd. (Osaka, JP)
Application Number:08/562,634
Patent Claim Types:
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Dosage form;

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Foreign Priority and PCT Information for Patent: 5,575,987

Foriegn Application Priority Data
Foreign Country Foreign Patent Number Foreign Patent Date
Japan4-234821Sep 02, 1992

International Patent Family for Patent: 5,575,987

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Austria175345► Subscribe
Canada2105374► Subscribe
Germany69322917► Subscribe
Denmark0586238► Subscribe
European Patent Office0586238► Subscribe
Spain2125953► Subscribe
Greece3029508► Subscribe
Japan3277342► Subscribe
JapanH06192068► 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:

Accenture
US Department of Justice
Healthtrust
Harvard Business School
Moodys
Deloitte
AstraZeneca
McKesson
Johnson and Johnson
Medtronic

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