US PATENT SUBCLASS 148 / 578
.~.~.~ Iron(Fe) or iron base alloy

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

DEFINITION

Classification: 148/578

Iron (Fe) or iron base alloy:

(under subclass 577) Process wherein the metal undergoing treatment is iron (Fe) or an iron alloy containing greater than 50 percent iron.