US PATENT SUBCLASS 424 / 473
.~.~.~.~ With porous, perforated, apertured, or sieved layer (e.g., dialyzing layer, microporous layer, etc.)


Current as of: June, 1999
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424 /   HD   DRUG, BIO-AFFECTING AND BODY TREATING COMPOSITIONS

400  DF  PREPARATIONS CHARACTERIZED BY SPECIAL PHYSICAL FORM {12}
464  DF  .~ Tablets, lozenges, or pills {5}
468  DF  .~.~ Sustained or differential release type {3}
472  DF  .~.~.~ Layered unitary dosage forms {1}
473.~.~.~.~ With porous, perforated, apertured, or sieved layer (e.g., dialyzing layer, microporous layer, etc.)


DEFINITION

Classification: 424/473

With porous, perforated, apertured, or sieved layer (e.g., dialyzing layer, microporous layer, etc.):

(under subclass 472) Subject matter in which a sustained or differential release by means of a perforate or porous layer.