US PATENT SUBCLASS 148 / 606
.~.~.~.~ Treating with specified agent (e.g., heat exchange agent, protective agent, decarburizing agent, denitriding agent, etc.) or vacuum

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}
605  DF  .~.~.~ Nine percent or more chromium(Cr) (e.g., Stainless steel, etc.) {4}
606.~.~.~.~ Treating with specified agent (e.g., heat exchange agent, protective agent, decarburizing agent, denitriding agent, etc.) or vacuum

DEFINITION

Classification: 148/606

Treating with specified agent (e.g., heat exchange agent, protective agent, decarburizing agent, denitriding agent, etc.) or vacuum:

(under subclass 605) Process wherein a vacuum or treating agent (e.g., heat exchange agent, protective agent, decarburizing agent, denitriding agent, etc.) specified as an element, compound, or composition other than air or water is utilized to treat the iron or iron alloy.