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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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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 Publication Date Supplementary Protection Certificate SPC Country SPC Expiration
Spain2125953Mar 16, 1999
European Patent Office0586238Mar 09, 1994
European Patent Office0586238Jun 29, 1994
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Preferred citation:

Friedman, Y. Location of pharmaceutical innovation: 2000–2009 Nature Reviews Drug Discovery 9, 835–836 (2010).

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