US PATENT SUBCLASS 148 / 647
.~.~.~.~ Die 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}
646  DF  .~.~.~ With restraining of metal from expanding or contracting during heating or cooling {1}
647.~.~.~.~ Die quenching


DEFINITION

Classification: 148/647

Die quenching:

(under subclass 646) Process wherein the workpiece is restrained in a die while undergoing a rapid cooling (i.e., quenching) operation.