US PATENT SUBCLASS 416 / 236 A
.~.~.~ Concentric or circular ribs

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}
236 R  DF  .~.~ Ribbed or grooved {1}
236 A.~.~.~ Concentric or circular ribs

Unofficial Alpha Subclasses: R A

DEFINITION

Classification: 416/236

(under subclass 235) Apparatus wherein the blade surface has rib means thereon or has grooves shaped therein.