US PATENT SUBCLASS 164 / 421
.~.~ Hollow casting
Current as of:
June, 1999
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164 /
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METAL FOUNDING
271
DF
MEANS TO SHAPE METALLIC MATERIAL
{12}
418
DF
.~ Continuous or semicontinuous casting {12}
421
.~.~ Hollow casting {1}
422
DF
.~.~.~
> Rotary mold
DEFINITION
Classification: 164/421
Hollow casting:
(under subclass 418) Apparatus wherein the product formed contains a central cavity.