US PATENT SUBCLASS 210 / 487
.~.~.~ Concentric, convolute or pleated

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

DEFINITION

Classification: 210/487

(under subclass 486) Apparatus comprising (1) concentric walls, (2) spirally arranged, or (3) pleated.