US PATENT SUBCLASS 148 / 581
.~.~.~ Railway stock (e.g., rails, wheels, axles, etc.)

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}
581.~.~.~ Railway stock (e.g., rails, wheels, axles, etc.) {4}
582  DF  .~.~.~.~> Treating with specified agent (e.g., heat exchange agent, protective agent, decarburizing agent, denitriding agent, etc.) or vacuum
583  DF  .~.~.~.~> Wheel
584  DF  .~.~.~.~> With working
585  DF  .~.~.~.~> With work handling

DEFINITION

Classification: 148/581

Railway stock (e.g., rails, wheels, axles, etc.):

(under subclass 579) Process wherein the metal being treated is indicated to be stock including rails, wheels, axles, or other metal parts utilized with a railway system.