US PATENT SUBCLASS 416 / 235
.~ Irregular, flanged or channel forming blade surface

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

223 R  DF  SPECIFIC BLADE STRUCTURE (E.G., SHAPE, MATERIAL, ETC.) {18}
235.~ Irregular, flanged or channel forming blade surface {2}
236 R  DF  .~.~> Ribbed or grooved {1}
237  DF  .~.~> Angular or offset

DEFINITION

Classification: 416/235

(under subclass 223) Apparatus wherein the blade surface (1) deviates from a smooth symmetric shape, (2) has rib or rim means thereon or (3) is so configured as to form a channel.