US PATENT SUBCLASS 148 / 577
.~.~ Chilling to subambient temperature

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}
577.~.~ Chilling to subambient temperature {1}
578  DF  .~.~.~> Iron(Fe) or iron base alloy

DEFINITION

Classification: 148/577

Chilling to subambient temperature:

(under subclass 559) Process wherein the metal is subjected to treatment at below ambient temperature (i.e., below 20 deg.C).

SEE OR SEARCH THIS CLASS, SUBCLASS:

517, for processes using subambient temperature to treat a layered workpiece or article.