US PATENT SUBCLASS 148 / 212
.~.~.~ Nitriding

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}
210  DF  .~.~ Of selected surface area (e.g., zone, top only, etc.) {3}
212.~.~.~ Nitriding

DEFINITION

Classification: 148/212

Nitriding:

(under subclass 210) Process which involves exposing a metal substrate or workpiece to an external reactive agent containing nitrogen that causes formation of a nitrogen enriched layer by reacting with the metal substrate or workpiece at any stage in the process.