US PATENT SUBCLASS 424 / 469
.~.~.~ Discrete particles in supporting matrix

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}
469.~.~.~ Discrete particles in supporting matrix {1}
470  DF  .~.~.~.~> Where particles are granulated

DEFINITION

Classification: 424/469

Discrete particles in supporting matrix:

(under subclass 468) Subject matter in which discrete soluble particles of the active ingredient are positioned or dispersed in a solid, generally insoluble matrix from which said particles are leached sequentially under conditions of use from the outside portions of the matrix inwardly.

SEE OR SEARCH THIS CLASS, SUBCLASS:

458+, for a capsule containing discrete coated particles.

484+, for a matrix containing a drug.

489+, for coated or impregnated particles carrying a drug.