US PATENT SUBCLASS 148 / 236
.~.~.~ Utilizing solid carbonaceous material containing free carbon, coal, peat, or coke

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}
225  DF  .~.~ Iron(Fe) or iron base alloy {7}
236.~.~.~ Utilizing solid carbonaceous material containing free carbon, coal, peat, or coke

DEFINITION

Classification: 148/236

Utilizing solid carbonaceous material containing free carbon, coal, peat, or coke:

(under subclass 225) Process wherein a solid carbonaceous material containing free carbon, coal, peat, or coke is utilized at any stage in the process.