US PATENT SUBCLASS 148 / 640
.~.~.~.~ Utilizing protective or insulating shielding from heat

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  DF  .~.~.~ Localized or zone heating or cooling {5}
640.~.~.~.~ Utilizing protective or insulating shielding from heat

DEFINITION

Classification: 148/640

Utilizing protective or insulating shielding from heat:

(under subclass 639) Process wherein a mechanical barrier or shield is utilized to protect or insulate the local area or zone of metal from heat.