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Details for Patent: 4,677,191

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Summary for Patent: 4,677,191

Title: Copolymer and method for producing the same
Abstract:A copolymer of lactic acid and glycolic acid which has a weight-average molecular weight of not less than about 5000 and a dispersity of about 1.5 to 2 is advantageously used as a biodegradable polymer for medical preparation.
Inventor(s): Tanaka; Motoaki (Urawa, JP), Ogawa; Yasuaki (Ibaraki, JP), Miyagawa; Tsutomu (Kawagoe, JP), Watanabe; Toshio (Kawagoe, JP)
Assignee: Wada Pure Chemical Ind., Ltd. (Higashi, JP) Takeda Chemical Industries, Ltd. (Higashi, JP)
Application Number:06/751,672
Patent Claim Types:
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Compound; Use;

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Foreign Priority and PCT Information for Patent: 4,677,191

Foriegn Application Priority Data
Foreign Country Foreign Patent Number Foreign Patent Date
Japan59-140356Jul 06, 1984

International Patent Family for Patent: 4,677,191

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Austria39935► Subscribe
Austria39936► Subscribe
Bulgaria61520► Subscribe
Canada1236641► Subscribe
Canada1256638► 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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