Details for Patent: 5,716,640
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Summary for Patent: 5,716,640
| 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: | 08/705,348 |
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Patent Claim Types: see list of patent claims | Use; Dosage form; |
Drugs Protected by US Patent 5,716,640
| Applicant | Tradename | Generic Name | Dosage | NDA | Approval Date | TE | Type | RLD | RS | Patent No. | Patent Expiration | Product | Substance | Delist Req. | Patented / Exclusive Use | Submissiondate |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| >Applicant | >Tradename | >Generic Name | >Dosage | >NDA | >Approval Date | >TE | >Type | >RLD | >RS | >Patent No. | >Patent Expiration | >Product | >Substance | >Delist Req. | >Patented / Exclusive Use | >Submissiondate |
Foreign Priority and PCT Information for Patent: 5,716,640
| Foriegn Application Priority Data | ||
| Foreign Country | Foreign Patent Number | Foreign Patent Date |
| Japan | 4-234821 | Sep 02, 1992 |
International Family Members for US Patent 5,716,640
| Country | Patent Number | Estimated Expiration | Supplementary Protection Certificate | SPC Country | SPC Expiration |
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| Austria | 175345 | ⤷ Sign Up | |||
| Canada | 2105374 | ⤷ Sign Up | |||
| Germany | 69322917 | ⤷ Sign Up | |||
| Denmark | 0586238 | ⤷ Sign Up | |||
| European Patent Office | 0586238 | ⤷ Sign Up | |||
| Spain | 2125953 | ⤷ Sign Up | |||
| Greece | 3029508 | ⤷ Sign Up | |||
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