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Details for Patent: 5,814,342

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Summary for Patent: 5,814,342

Title: Prolonged release microcapsules
Abstract:This invention provides a microcapsule designed for zero order release of a physiologically active polypeptide over a period of at least two months, which is produced by preparing a water-in-oil emulsion comprising an inner aqueous layer containing about 20 to 70% (w/w) of said polypeptide and an oil layer containing a copolymer or homopolymer having a weight-average molecular weight of 7,000 to 30,000, wherein the composition ratio of lactic acid/glycolic acid in the copolymer or homopolymer is 80/10 to 100/0, and then subjecting said water-in oil emulsion to microencapsulation.
Inventor(s): Okada; Hiroaki (Suita, JP), Inoue; Yayoi (Kyoto, JP), Ogawa; Yasuaki (Otokuni-gun, JP)
Assignee: Takeda Chemical Industries, Ltd. (Osaka, JP)
Application Number:08/806,954
Patent Claim Types:
see list of patent claims
Compound; Dosage form; Process;
Patent Metrics:
Source: PatentQuant.com
Field: Not categorized
Back Citations: 26th percentile
Forward Citations: 2nd percentile

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Foreign Priority and PCT Information for Patent: 5,814,342

Foriegn Application Priority Data
Foreign Country Foreign Patent Number Foreign Patent Date
Japan2-33133Feb 13, 1990

International Patent Family for Patent: 5,814,342

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Austria123413<disabled in preview>
Australia645108<disabled in preview>
Australia8179491<disabled in preview>
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The estimated expiration dates shown above are derived by simply adding 20 years to the priority date.
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