US PATENT SUBCLASS 148 / 219
.~.~.~ With working, machining, cutting, or post-carburizing and post-nitriding heating or quenching

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}
218  DF  .~.~ Combined carburizing and nitriding (e.g., carbonitriding, nitrocarburizing, etc.) {1}
219.~.~.~ With working, machining, cutting, or post-carburizing and post-nitriding heating or quenching

DEFINITION

Classification: 148/219

With working, machining, cutting, or post-carburizing and post-nitriding heating or quenching:

(under subclass 218) Process which includes either (1) a step of deforming solid metal or mechanically cutting or grinding away of portions of solid metal to produce a desired shape or form, or (2) a post-carburizing or post-nitriding heating or sudden cooling (i.e., quenching) operation.