US PATENT SUBCLASS 210 / 494.3
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Current as of: June, 1999
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210 /   HD   LIQUID PURIFICATION OR SEPARATION

348  DF  FILTER {25}
483  DF  .~ Supported, shaped or superimposed formed mediums {11}
494.1  DF  .~.~ Convolute {2}
494.3.~.~.~ With edge spacer

DEFINITION

Classification: 210/494.3

With edge spacer:

(under subclass 494.1) Apparatus having means at the edge of the filter medium to space consecutive convolutions.