US PATENT SUBCLASS 416 / 228
.~ Tined or irregular periphery

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}
228.~ Tined or irregular periphery

DEFINITION

Classification: 416/228

(under subclass 223) Apparatus wherein the impeller* (1) comprises a plurality of elongate rod-like working members* projecting from a common carrier* or (2) is so shaped as to define an edge outline which markedly deviates from a smooth configuration.