US PATENT SUBCLASS 55 / 520
SPIRAL FILTER MEDIA


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

520SPIRAL FILTER MEDIA


DEFINITION

Classification: 55/520

(under the class definition) Apparatus comprising a filter element which is rolled or wound either in face-to-face or spaced relation to form one or more spiral convolutions.

SEE OR SEARCH THIS CLASS, SUBCLASS:

498, for filter sheet(s) edge supported in spiral form and subclass 484 for a spiral arrangement of spaced convolutions providing parallel flow for gas.

527, for a strand which is indiscriminately wound around itself, but not in a spiral.