US PATENT SUBCLASS 148 / 209
.~.~ Utilizing particulate fluid bed


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}
209.~.~ Utilizing particulate fluid bed


DEFINITION

Classification: 148/209

Utilizing particulate fluid bed:

(under subclass 206) Process in which a particulate fluid bed is utilized at any stage in a process of treating a metal or metal alloy for purposes of heat transfer or carburization or nitridization or both.