US PATENT SUBCLASS 416 / 242
.~ Reverse curve 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}
242.~ Reverse curve surface

DEFINITION

Classification: 416/242

(under subclass 223) Apparatus wherein a surface of the blade is curved in two or more directions, (e.g., sinuous).

SEE OR SEARCH THIS CLASS, SUBCLASS:

235+, for an impeller blade having an undulating or rippled surface.