US PATENT SUBCLASS 239 / 57
.~ With support for porous or apertured encasing means

Current as of: June, 1999
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239 /   HD   FLUID SPRINKLING, SPRAYING, AND DIFFUSING

34  DF  SLOW DIFFUSERS {9}
57.~ With support for porous or apertured encasing means

DEFINITION

Classification: 239/57

(under subclass 34) Apparatus in which an apertured or foraminous housing surrounding the material is provided with an added element or additional feature by which the housing is maintained in place while in normal use to disperse the material.