CA2178620A1 — Microsphere drug delivery system
Assigned to Vitaphore Corp · Expires 1995-06-15 · 31y expired
What this patent protects
A sustained release drug delivery composition and a method of making same are provided which comprises microspheres containing a pharmaceutically active agent, a core of an ion-exchange resin and a polymeric coating completely surrounding the core wherein the coating is water-ins…
USPTO Abstract
A sustained release drug delivery composition and a method of making same are provided which comprises microspheres containing a pharmaceutically active agent, a core of an ion-exchange resin and a polymeric coating completely surrounding the core wherein the coating is water-insoluble and hydrolytically stable in physiological environments. The coating is non-erodible in physiological environments and is characterized by a diffusion constant suitable for the pharmaceutical agent to diffuse from the core to an aqueous environment at a predetermined release rate.
Drugs covered by this patent
Bibliographic data sourced from FDA Orange Book + USPTO public records. Plain-English summary generated by AI grounded in source text. Patent term extensions (PTR, SPC, pediatric) may shift the effective expiry. Not legal advice.
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