US PATENT SUBCLASS 427 / 2.16
.~.~.~ Retarded or controlled-release layer produced (e.g., enteric)

Current as of: June, 1999
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427 /   HD   COATING PROCESSES

2.1  DF  MEDICAL OR DENTAL PURPOSE PRODUCT; PARTS; SUBCOMBINATIONS; INTERMEDIATES (E.G., BALLOON CATHETER, SPLINT) {7}
2.14  DF  .~ Particulate or unit-dosage-article base (e.g., tablet, pill, pellet, capsule, liposome, powder, controlled-release implant, suppository; excluding transdermal patch) {5}
2.15  DF  .~.~ Fluidized bed utilized {2}
2.16.~.~.~ Retarded or controlled-release layer produced (e.g., enteric)

DEFINITION

Classification: 427/2.16

Retarded or controlled-release layer produced (e.g., enteric):

(under subclass 2.15) Processes in which the product is intended to provide retarded (or delayed), timed, differential, sustained, or intermittent administration (or delivery) of an active ingredient.

(1) Note. Merely providing a product protected for storage or handling is not included here. For placement here, the control layer must do more than protect against ambient conditions or against the conditions of the mouth. Examples of types of products proper for placement here include the following: continuous delivery by slow or slowed release; discontinuous delivery by two or more stages; enteric coating for protection from stomach conditions for product intended to be orally administered; sustained or differential release implant or insert such as a suppository.

SEE OR SEARCH THIS CLASS, SUBCLASS:

2.19, for similar subject matter involving an en masse rotating means rather than a fluidized bed.

2.21, for similar subject matter not involving either a fluidized bed or an en masse rotating means.

SEE OR SEARCH CLASS

424, Drug, Bio-Affecting and Body Treating Compositions, for pharmaceutical and diagnostic compositions which are defined in terms of specific structure such as coated so that the active ingredient is released in a retarded (or delayed), timed, differential, sustained, or intermittent manner; see 422+, for implant or insert; subclasses 457+ for sustained or differential release composition in a capsule; subclasses 468+ for tablet, lozenge, or pill; and subclasses 474+ for enteric coated medicament.