US PATENT SUBCLASS 210 / 497.1
.~.~.~ Helically wound

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}
497.01  DF  .~.~ Cylindrical, conical, or trough shape {3}
497.1.~.~.~ Helically wound

DEFINITION

Classification: 210/497.1

(under subclass 497.01) Apparatus which comprises a filter formed from indefinite length material coiled in such a manner as to generate convolutions about an axis with each convolution displaced along said axis from the previous convolutions.

SEE OR SEARCH THIS CLASS, SUBCLASS:

494.1+, for convolute wound filters.