US PATENT SUBCLASS 424 / 424
.~.~.~ Membrane or diffusion barrier


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}
422  DF  .~ Implant or insert {5}
423  DF  .~.~ Surgical implant or material {2}
424.~.~.~ Membrane or diffusion barrier {1}
425  DF  .~.~.~.~> Diffusion barrier is matrix


DEFINITION

Classification: 424/424

Membrane or diffusion barrier:

(under subclass 423) Subject matter in which the sustained or differential release of active pharmaceutical takes place through a membrane or diffusion barrier.