US PATENT SUBCLASS 148 / 625
.~.~.~ 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}
625.~.~.~ Treating with specified agent (e.g., heat exchange agent, protective agent, decarburizing agent, denitriding agent, etc.) or vacuum {8}
626  DF  .~.~.~.~> With preserving, recovering, separately treating or handling of the specified treating agent
627  DF  .~.~.~.~> With localized or zone heating or cooling
628  DF  .~.~.~.~> Using vacuum
629  DF  .~.~.~.~> Decarburizing or denitriding
630  DF  .~.~.~.~> Utilizing particulate fluid bed
631  DF  .~.~.~.~> Fused treating agent {1}
633  DF  .~.~.~.~> Gaseous agent {2}
636  DF  .~.~.~.~> Liquid agent {1}

DEFINITION

Classification: 148/625

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

(under subclass 579) Process wherein a vacuum or a 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, per se, to treat the iron or iron alloy.