Patent ID: 9370049
Filing Date: 2016-06-14
CPC Classification: H05B

Claim Text:
1. A method of heating and melting a transition material, the method comprising the steps of: depositing the transition material in a non-electrically conductive state in a susceptor vessel having a lower section surrounded by at least one active induction coil connected to an output of a variable frequency power supply, and an upper section above the lower section surrounded by at least one secondary induction coil connected to at least one resonance capacitor to form a passive coil circuit; supplying power from the output of the variable frequency power supply to the at least one active induction coil at a start frequency so that a standard depth of penetration is not substantially greater than a wall thickness of the susceptor vessel to electromagnetically heat the susceptor vessel and transition the transition material in the susceptor vessel to an electrically conductive state by conduction heating supplied from the susceptor vessel; and reducing the frequency of the output of the variable frequency power supply from the start frequency to an intermediate frequency responsive to the transition of the transition material in the susceptor vessel from the non-electrically conductive state to the electrically conductive state.