US PATENT SUBCLASS 148 / 278
.~.~ Carbide formation, decarburization or carbonizing

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}
240  DF  .~ Processes of coating utilizing a reactive composition which reacts with metal substrate or composition therefore {12}
278.~.~ Carbide formation, decarburization or carbonizing

DEFINITION

Classification: 148/278

Carbide formation, decarburization or carbonizing:

(under subclass 240) Subject matter wherein a carbide is formed, decarburizing occurs, or a carburizing reaction is involved.

SEE OR SEARCH THIS CLASS, SUBCLASS:

206, through 238, for carburizing, nitriding, or both (e.g., carbonitriding) using an external source of carbon or nitrogen.

(1) Note. Thus, for this subclass the carbide formation or carbonizing requires an external noncarbon or nonnitrogen containing external reactant and the source of the carbon is the substrate. Metallization of high carbon content alloy substrate by vapor deposition of a metal without diffusion of carbon to form a carbide containing coating thereon is an example of the type reactive coating provided in this subclass.