US PATENT SUBCLASS 148 / 207
.~.~ Carburizing or nitriding uniformly throughout the entire mass (i.e., internal carburizing)

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}
207.~.~ Carburizing or nitriding uniformly throughout the entire mass (i.e., internal carburizing)

DEFINITION

Classification: 148/207

Carburizing or nitriding uniformly throughout the entire mass (i.e., internal carburizing):

(under subclass 206) Process in which carburizing or nitridizing is not limited to the surface of a metal or metal alloy and which occurs throughout the entire metal substrate.

(1) Note. This is not to be confused with carburizing or nitriding which produces a case or layer of increased carbon or nitrogen content on the external surface of a metal or metal alloy substrate.