US PATENT SUBCLASS 148 / 217
.~.~ With noncarburizing or non-nitriding reactive coating (e.g., oxidizing, siliconizing, boronizing, 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}
217.~.~ With noncarburizing or non-nitriding reactive coating (e.g., oxidizing, siliconizing, boronizing, etc.)

DEFINITION

Classification: 148/217

With noncarburizing or non-nitriding reactive coating (e.g., oxidizing, siliconizing, boronizing, etc.):

(under subclass 206) Process which includes a distinct and separate operation involving coating of a metal or metal alloy substrate with a material that reacts with the metal to provide a coating thereon containing the reaction product of the metal with an externally supplied reactant other than a carburizing or nitriding reactant.

SEE OR SEARCH THIS CLASS, SUBCLASS:

240, through 297, for processes of reactive coating of metal not involving carburizing or nitriding.