US PATENT SUBCLASS 210 / 486
.~.~ Spaced wall type, e.g., hollow leaf

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}
486.~.~ Spaced wall type, e.g., hollow leaf {1}
487  DF  .~.~.~> Concentric, convolute or pleated

DEFINITION

Classification: 210/486

(under subclass 483) Apparatus in which the medium comprises spaced walls.

SEE OR SEARCH THIS CLASS, SUBCLASS:

461, for similar structure attached to the open end of a pipe.