US PATENT SUBCLASS 148 / 639
.~.~.~ Localized or zone heating or cooling

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}
639.~.~.~ Localized or zone heating or cooling {5}
640  DF  .~.~.~.~> Utilizing protective or insulating shielding from heat
641  DF  .~.~.~.~> Simultaneous heating and cooling treatment
642  DF  .~.~.~.~> Heating with flame treatment
643  DF  .~.~.~.~> With working
644  DF  .~.~.~.~> Cooling

DEFINITION

Classification: 148/639

Localized or zone heating or cooling:

(under subclass 579) Process wherein a heating or cooling operation is applied to a discontinuous area of the metal workpiece to provide treatment limited to one or several local areas or zones and not to another adjacent area.