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Induction heating coils

  • US 3,256,417 A
  • Filed: 07/12/1963
  • Issued: 06/14/1966
  • Est. Priority Date: 08/09/1962
  • Status: Expired due to Term
First Claim
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1. A FLAT COUPLING COIL SUITABLE FOR INDUCING EDDY CURRENTS IN A FLAT SURFACE SUCH AS THE METAL BOTTOM OF A POT TO HEAT IT, IN WHICH THE COIL IS WOUND WITH CONDUCTORS SO THAT IN ANY SECTION THROUGH THE AXIS OF THE COIL THE CONDUCTORS ARE ARRANGED AT DIFFERNET DISTANCE FROM THE SURFACE BEING HEATED, AND INCLUDING A NUMBER OF SEPARATE CURRENT PATH ELECTRICALLY CONNECTED IN PARALLEL, EACH PATH HAVING PARTS OF ITS LENGTH NEAREST TO THE SURFACE BEING HEATED AND PARTS FARTHER FROM IT, AND SAID COIL COMPRISING A PLURALITY OF AXIALLY SUPERPOSED LAYERS EACH LAYER INCLUDING A PLURALITY OF CONDUCTOR SECTIONS ONE WITHIN THE OTHER AND EACH CURRENT PATH INCLUDING A SECTION OF EACH LAYER.

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