US PATENT SUBCLASS 210 / 493.4
.~.~.~ Spirally formed

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}
493.1  DF  .~.~ Pleated {4}
493.4.~.~.~ Spirally formed

DEFINITION

Classification: 210/493.4

Spirally formed:

(under subclass 493.1) Apparatus having a helically shaped

filter medium.