US PATENT SUBCLASS 219 / 631
.~.~.~.~.~ Core rotation

Current as of: June, 1999
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219 /   HD   ELECTRIC HEATING

600  DF  INDUCTIVE HEATING {7}
618  DF  .~ With heat exchange {6}
628  DF  .~.~ Fluid or liquid heater {1}
629  DF  .~.~.~ By tube (i.e., pipe) {1}
630  DF  .~.~.~.~ Core or coil structure {1}
631.~.~.~.~.~ Core rotation

DEFINITION

Classification: 219/631

Core rotation:

(under subclass 630) Subject matter wherein the core is subjected to a spinning or circular motion relative about its axis.