US PATENT SUBCLASS 210 / 458
.~.~ Plural concentric receivers

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

348  DF  FILTER {25}
457  DF  .~ With central pervious tubular receiver {1}
458.~.~ Plural concentric receivers

DEFINITION

Classification: 210/458

(under subclass 457) Apparatus in which there are two or more liquid receivers having a common axis.

SEE OR SEARCH THIS CLASS, SUBCLASS:

315, for one diverse filter spaced within another.

338, for nested concentric filters.

342, for one filter with another.

489+, for superimposed filter mediums arranged for series flow.