US PATENT SUBCLASS 55 / 498
.~.~.~ Spiral or cylindrical

Current as of: June, 1999
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55 /   HD   GAS SEPARATION

490  DF  WITH MEANS SECURING OR RETAINING SEPARATING MEDIA {7}
495  DF  .~ Unit or cohesive sheet-like media in flow line or frame {12}
497  DF  .~.~ Edge supporting or securing means for nonplanar sheet form filter (e.g., zigzag) {2}
498.~.~.~ Spiral or cylindrical

DEFINITION

Classification: 55/498

(under subclass 497) Apparatus in which the resulting shape of the media takes the form of a cylinder or spiral.