US PATENT SUBCLASS 424 / 457
.~.~ Sustained or differential release

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}
451  DF  .~ Capsules (e.g., of gelatin, of chocolate, etc.) {6}
457.~.~ Sustained or differential release {1}
458  DF  .~.~.~> Containing discrete coated particles pellets, granules, or beads {1}

DEFINITION

Classification: 424/457

Sustained or differential release:

(under subclass 451) Subject matter in which the timing or spacing of administration or absorption of an active ingredient in a system, (e.g., animal body) is regulated by the structure or physical arrangement of elements so that a single administration provides: (a) a gradual but continuous feeding of the active ingredient to the system by slow release or (b) discontinuous feeding in two or more distinct stages.

(1) Note. An enteric coated medicament, per se, is not considered to be within the scope of this or the indented subclasses. Such a product, generally is a form, or with a coating designed to enable physical passage through or to resist the acid gastric juices for eventual dissolution or use through or in intestines, is classified elsewhere below, for example, on the basis of the particular disclosed enteric coating. Patents placed in this subclass, however, may claim an enteric coating in addition to a sustained release or differential release mechanism as defined.

(2) Note. An claimed composition which does not recite structure, but is disclosed to have a sustained release or differential release action, is classified elsewhere according to the nature of the ingredients therein, see, for example, subclass 78.01 which provides for the combination of an active ingredient bound to an ion exchange type synthetic resin or subclass 48 in which active ingredients distributed homogeneously throughout a chewing gum base are released progressively therefrom by chewing and mixing with saliva.

SEE OR SEARCH THIS CLASS, SUBCLASS:

422+, for an implant or insert for sustained release of a drug.

449, for a transdermal or percutaneous bandage for sustained release of a drug.

468, for a sustained or differential release tablet.