US PATENT SUBCLASS 416 / 237
.~.~ Angular or offset

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  DF  .~ Irregular, flanged or channel forming blade surface {2}
237.~.~ Angular or offset

DEFINITION

Classification: 416/237

(under subclass 235) Apparatus wherein the blade comprises two or more flat surfaces which (1) intersect in an angular relationship or (2) lie in different but substantially parallel planes united by a blade portion normal to the said surfaces.

SEE OR SEARCH THIS CLASS, SUBCLASS:

183, for an impeller comprising a radially extending flow directing surface and a blade having circumferentially or radially offset parts.