US PATENT SUBCLASS 416 / 181
.~ Apertured or foraminous web or shroud

Current as of: June, 1999
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416 /   HD   FLUID REACTION SURFACES (I.E., IMPELLERS)

179  DF  ROTOR HAVING FLOW CONFINING OR DEFLECTING WEB, SHROUD OR CONTINUOUS PASSAGE {4}
181.~ Apertured or foraminous web or shroud

DEFINITION

Classification: 416/181

(under subclass 179) Apparatus wherein the circumferentially continuous medium flow directing surface has one or more apertures therein.