US PATENT SUBCLASS 29 / 889.72
.~.~.~ Hollow blade

Current as of: June, 1999
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29 /   HD   METAL WORKING

592  DF  METHOD OF MECHANICAL MANUFACTURE {54}
889  DF  .~ Impeller making {7}
889.7  DF  .~.~ Blade making {2}
889.72.~.~.~ Hollow blade {1}
889.721  DF  .~.~.~.~> With cooling passage {1}

DEFINITION

Classification: 29/889.72

Hollow blade:

(under subclass 889.7) Process wherein the interior of the blade includes substantial open space.

SEE OR SEARCH CLASS

416, Fluid Reaction Surfaces (i.e., Impellers),

232, and 233 for hollow blade structure.