US PATENT SUBCLASS 164 / 16
.~.~.~ Chemically reactive gas hardening of forming material

Current as of: June, 1999
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164 /   HD   METAL FOUNDING

1  DF  PROCESS {6}
6  DF  .~ Shaping a forming surface (e.g., mold making, etc.) {8}
15  DF  .~.~ Shaping fluent material to form mold {9}
16.~.~.~ Chemically reactive gas hardening of forming material

DEFINITION

Classification: 164/16

(under subclass 15) Process directed to perfecting the hardening of the forming surface of a mold structure by contacting the surface with a gaseous medium which is chemically reactive with the mold material.