US PATENT SUBCLASS 210 / 293
.~.~ Floor type, e.g., false bottom

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

263  DF  PARTICULATE MATERIAL TYPE SEPARATOR, E.G., ION EXCHANGE OR SAND BED {13}
291  DF  .~ Particular liquid receiving means or foraminous bed retainer {2}
293.~.~ Floor type, e.g., false bottom

DEFINITION

Classification: 210/293

(under subclass 291) Apparatus wherein the bed retainer comprises a pervious floor.