US PATENT SUBCLASS 148 / 637
.~.~.~.~.~ And cooling or quenching


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}
559  DF  .~ Heating or cooling of solid metal {22}
579  DF  .~.~ Iron(Fe) or iron base alloy {24}
625  DF  .~.~.~ Treating with specified agent (e.g., heat exchange agent, protective agent, decarburizing agent, denitriding agent, etc.) or vacuum {8}
636  DF  .~.~.~.~ Liquid agent {1}
637.~.~.~.~.~ And cooling or quenching {1}
638  DF  .~.~.~.~.~.~> Treating composition contains water


DEFINITION

Classification: 148/637

And cooling or quenching:

(under subclass 636) Process which includes a cooling or quenching operation.