US PATENT SUBCLASS 148 / 210
.~.~ Of selected surface area (e.g., zone, top only, etc.)

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.~.~ Of selected surface area (e.g., zone, top only, etc.) {3}
211  DF  .~.~.~> With working, machining, or cutting
212  DF  .~.~.~> Nitriding
213  DF  .~.~.~> Utilizing attached protective shield, mask or coating {1}

DEFINITION

Classification: 148/210

Of selected surface area (e.g., zone, top only, etc.):

(under subclass 206) Process wherein only a partial area (e.g., zone, etc.) or portion (e.g., top only, etc.) of a workpiece surface is subjected to carburization or nitridization.

(1) Note. During carburizing or nitridizing, penetration of carbon or nitrogen into the metal substrate or reaction therewith creates what is often referred to as a gradient referring to variation in composition with depth. This should not be confused with the zone or portion of the surface referred to in this subclass.