US PATENT SUBCLASS 210 / 290
.~ With multi-layer beds

Current as of: June, 1999
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210 /   HD   LIQUID PURIFICATION OR SEPARATION

263  DF  PARTICULATE MATERIAL TYPE SEPARATOR, E.G., ION EXCHANGE OR SAND BED {13}
290.~ With multi-layer beds

DEFINITION

Classification: 210/290

(under subclass 263) Apparatus having a bed comprising a plurality of layers of particulate material which are in contact with each other.

SEE OR SEARCH THIS CLASS, SUBCLASS:

283, for a pervious divider between and contacting the beds.

284, for similar apparatus in which the beds are spaced from each other.

286, for vertical layers.