US PATENT SUBCLASS 416 / 232
.~ Hollow

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}
232.~ Hollow {1}
233  DF  .~.~> Having brace means bridging cavity

DEFINITION

Classification: 416/232

(under subclass 223) Apparatus wherein the blade comprises a shell which defines a blade cavity.

SEE OR SEARCH THIS CLASS, SUBCLASS:

90+, and 96+, for blades having fluid flow conducting passages therein.