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Conversion of liquid filled gelatin capsules into controlled release systems by multiple coatings

  • US 6,929,803 B2
  • Filed: 04/04/2002
  • Issued: 08/16/2005
  • Est. Priority Date: 12/17/1998
  • Status: Expired due to Fees
First Claim
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1. A dosage form comprising:

  • a gelatin capsule containing a liquid, active agent formulation;

    a barrier layer surrounding a wall of the gelatin capsule;

    an expandable layer surrounding the barrier layer;

    a semipermeable layer surrounding the expandable layer; and

    an orifice formed or formable through the barrier, expandable, and semipermeable layers;

    wherein the barrier layer separates the wall of the gelatin capsule from the expandable layer.

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