US PATENT SUBCLASS 148 / 571
.~.~.~.~.~ Inside only

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}
566  DF  .~.~ Electric heating with work as conductor (e.g., alternating current, induction, etc.) {2}
567  DF  .~.~.~ Induction {6}
570  DF  .~.~.~.~ Of hollow bodies (e.g., pipe, sphere, etc.) {1}
571.~.~.~.~.~ Inside only

DEFINITION

Classification: 148/571

Inside only:

(under subclass 570) Process wherein the hollow workpiece being treated is heated by induction applied only from the inside thereof.