Abstract: In an induction cooking apparatus, an electrostatic shield is interposed between the work coil and the location of the cooking vessel upon the sheet forming a cook top to reduce the capacitive coupling between the coil and the cooking vessel to accordingly reduce the voltage between the vessel and ground.

Abstract: An induction heating coil assembly including a flat induction coil wound from a glass-braid-encased multi-wire conductor retained on a rigid asbestos-cement support plate by a number of radially-extending metal retainer clips snapped into openings in the support plate. A shorted turn of heavy copper wire encircles the heating coil to confine its magnetic field and act as a coil-proximity spacer in cooperation with the underside of the horizontal glass panel member that forms the pan-support surface of a smooth-top range. Brackets of electrical insulating material provide support for the coil support plate.

Abstract: The cooking vessel has a laminated wall including one layer of a magnetic material having a thickness, determined in accordance with skin depth as a function of the operating frequencies of the cooking device so that the major part of the power is developed in the one layer and substantial penetration of the magnetic field produced by the device beyond the layer is prevented, and another layer of relatively high thermal conductivity material which promotes the uniform distribution of heat derived from the magnetic layer throughout the other layer.