Flexible Flat-Rate Plans

Flat-rate pricing for predictable budgeting

Short-term plans for project- or client-based billing

► Plans and Pricing

Upgrade to enjoy subscriber-only features like email alerts and data export. See the Plans and Pricing

DrugPatentWatch Database Preview

Details for Patent: 5,716,640

« Back to Dashboard

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
Patent Claim Types:
see list of patent claims
Use; Dosage form;
Patent Metrics:
Source: PatentQuant.com
Field: Not categorized
Back Citations: 7th percentile
Forward Citations: 5th percentile
Patent PDF download available with subscription

No matches for this query

Foreign Priority and PCT Information for Patent: 5,716,640

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

International Patent Family for Patent: 5,716,640

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Austria175345<disabled in preview>
Canada2105374<disabled in preview>
Germany69322917<disabled in preview>
This preview shows a limited data set
Subscribe for full access, or try a Trial

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.

Export unavailable in trial.
Subscribe for complete access.

For more information try a trial or see the database preview and plans and pricing

How are People Using DrugPatentWatch?