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publicationDate 1989-05-09-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber US-4828840-A
titleOfInvention Sustained-release formulation and production thereof
abstract Sustained-release formulations which can release a water-soluble active ingredient or ingredients in zero-order manner over a long period of time, comprising: a. an inert core, b. a powder-coating layer containing a water-soluble active ingredient or ingredients, c. a powder-coating layer of practically water-repellent material, and d. a film-coating layer composed of practically pH-independent and water-insoluble film-coating material. c
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