US PATENT SUBCLASS 29 / 889.721
.~.~.~.~ With cooling passage

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  DF  .~.~.~ Hollow blade {1}
889.721.~.~.~.~ With cooling passage {1}
889.722  DF  .~.~.~.~.~> Passage contains tubular insert

DEFINITION

Classification: 29/889.721

With cooling passage:

(under subclass 889.72) Process wherein the interior open space serves to allow fluid to flow within the blade for heat dissipation purposes.