US PATENT SUBCLASS 210 / 480
.~.~.~.~ With contractor for expandable retainer

Current as of: June, 1999
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210 /   HD   LIQUID PURIFICATION OR SEPARATION

348  DF  FILTER {25}
473  DF  .~ Resting on supporting receiver, e.g., portable {3}
477  DF  .~.~ Resting on internal stop or surface {3}
479  DF  .~.~.~ Inner separate retainer {1}
480.~.~.~.~ With contractor for expandable retainer

DEFINITION

Classification: 210/480

(under subclass 479) Apparatus in which the retainer is expandable and has means for contracting the retainer to effect release of the filter medium.

SEE OR SEARCH THIS CLASS, SUBCLASS:

238, for a filter element and a handle for removing the element from a casing.