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Details for Patent: 6,699,503

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Summary for Patent: 6,699,503

Title: Hydrogel-forming sustained-release preparation
Abstract:The invention provides a hydrogen-type sustained-release preparation comprising (1) at least one drug, (2) an additive which insures a penetration of water into the core of the preparation and (3) a hydrogen-forming polymer, wherein said preparation is capable of undergoing substantially complete gelation during its stay in the upper digestive tract such as stomach and small intestine and is capable of releasing the drug in the lower digestive tract including colon. By the preparation of the invention, the drug is efficiently released and absorbed even in the colon so that a steady and sustained release effect can be achieved.
Inventor(s): Sako; Kazuhiro (Shizuoka, JP), Nakashima; Hiroshi (Shizuoka, JP), Sawada; Toyohiro (Shizuoka, JP), Okada; Akira (Shizuoka, JP), Fukui; Muneo (Shizuoka, JP)
Assignee: Yamanuchi Pharmaceutical Co., Ltd. (Tokyo, JP)
Application Number:09/702,880
Patent Claim Types:
see list of patent claims
Compound;
Patent Metrics:
Source: PatentQuant.com
Field: Pharmaceuticals
Back Citations: 28th percentile
Forward Citations: 1st percentile

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Foreign Priority and PCT Information for Patent: 6,699,503

Foriegn Application Priority Data
Foreign Country Foreign Patent Number Foreign Patent Date
Japan4-274979Sep 18, 1992
Japan5-165263Jun 08, 1993

International Patent Family for Patent: 6,699,503

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Austria219933<disabled in preview>
Australia4983893<disabled in preview>
Australia682827<disabled in preview>
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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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