US PATENT SUBCLASS 148 / 220
.~.~ With producing or treating of workpiece having plural noncarburized or non-nitrided layers or mechanically engaged article or stock

Current as of: June, 1999
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148 /   HD   METAL TREATMENT

95  DF  PROCESS OF MODIFYING OR MAINTAINING INTERNAL PHYSICAL STRUCTURE (I.E., MICROSTRUCTURE) OR CHEMICAL PROPERTIES OF METAL, PROCESS OF REACTIVE COATING OF METAL AND PROCESS OF CHEMICAL-HEAT REMOVING (E.G., FLAME-CUTTING, ETC.) OR BURNING OF METAL {17}
206  DF  .~ Carburizing or nitriding using externally supplied carbon or nitrogen source {15}
220.~.~ With producing or treating of workpiece having plural noncarburized or non-nitrided layers or mechanically engaged article or stock

DEFINITION

Classification: 148/220

With producing or treating of workpiece having plural noncarburized or non-nitrided layers or mechanically engaged article or stock:

(under subclass 206) Process which includes producing or treating of (1) a workpiece having plural noncarburized or non-nitrided layers, or (2) mechanically engaged article or mechanically engaged stock.

SEE OR SEARCH THIS CLASS, SUBCLASS:

516, for noncarburizing or non-nitriding processes of producing or treating of layered, bonded, welded, or mechanically engaged stock or article.