US PATENT SUBCLASS 148 / 208
.~.~ With decarburizing or denitriding

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}
208.~.~ With decarburizing or denitriding

DEFINITION

Classification: 148/208

With decarburizing or denitriding:

(under subclass 206) Process which includes at some stage in the process a procedure for elimination or reduction of the carbon content or the nitrogen content of a metal substrate by chemical or physical-chemical procedures and does not include mechanical procedures (e.g., grinding) for removal of the carbon or nitrogen containing metal.