US PATENT SUBCLASS 210 / 479
.~.~.~ Inner separate 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.~.~.~ Inner separate retainer {1}
480  DF  .~.~.~.~> With contractor for expandable retainer

DEFINITION

Classification: 210/479

(under subclass 477) Apparatus in which there is a member within the prefilt receiver usually a ring or cylinder, which clamps or retains the filter medium and/or its supporting structure against the inner wall of the prefilt receiver or against the stop member.