US PATENT SUBCLASS 219 / 613
.~.~.~.~.~ With impeder

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

600  DF  INDUCTIVE HEATING {7}
602  DF  .~ Metal working {1}
603  DF  .~.~ Bonding {7}
607  DF  .~.~.~ Tube (i.e., pipe) {5}
612  DF  .~.~.~.~ Seam bonding {2}
613.~.~.~.~.~ With impeder

DEFINITION

Classification: 219/613

With impeder:

(under subclass 612) Subject matter including a device which modifies or intensifies a current path traveling along the seam of the tube.

SEE OR SEARCH THIS CLASS, SUBCLASS:

670, for inductive heating systems with a specific transformer core structure.