Abstract: A range cook top is provided with circular heating zones having a layer of resistive thin film thereon. Slots in the cook top separate the heating zones from the surrounding areas of the cook top. The heating zone includes a resistive layer elements formed by a rectangular layer surrounded by annular arcuate segments. Power supply bus bars are disposed around edges of the resistive layer elements. A dual heater has separately controlled rectangular and annular resistive elements. Temperature sensors are also provided.

Abstract: Disclosed are heating and warming assemblies including an electrically resistive thin film. The assemblies generally include a planar substrate, a resistive film for heat generation, one or more electrically conductive electrodes in electrical association with the resistive film, and a non-stick layer disposed on the exposed surfaces of the assembly. The heating and warming assemblies according to the present invention are particularly well suited for use in heating devices and appliances such as ranges and griddles. The assemblies are also incorporated into heating panels for ovens.

Abstract: A range cook top is provided with circular heating zones having a layer of resistive thin film thereon. Slots in the cook top separate the heating zones from the surrounding areas of the cook top. Tongues of cook top material interrupt the slots and support the heating zones. The slots have beveled or stepped edges and beveled or stepped plastic inserts fill the slots to provide a smooth cook top. Sealer also fills the slots. The resistive layer in the heating zone is divided into arcuate segments by insulating partitions. Power supply bus bars are disposed around the outside edge of the resistive layer. A common bus bar interconnects the segments at the inner edges. A dual heater has separately controlled inner and outer resistive layers.

Abstract: A heating panel has a resistive heating layer formed on a substrate. Insulating layers can be formed on the substrate. The heating layer has electrodes on opposite edges connected to different phases of a multiphase power source. Capacitive currents caused in the substrate by the different phases cancel each other. Thus, leakage current is minimized through a conductor connected between the substrate and ground. The heating panel can be adapted for two phase or three phase systems. The heating panels are particularly useful for defining a heating cavity of an oven or pots on a cook top.

Abstract: A heating panel has a metal substrate, ceramic inner and outer insulating layers on the substrate. A film of resistive material forms a heating layer on one of the insulating layers. The heating layer has electrodes on opposite edges connected to different phases of a multiphase power source. Another electrode is connected to a neutral of the power source. Capacitive currents caused in the substrate by the different phases cancel each other. Thus, leakage current is minimized through a conductor connected between the substrate and ground. The heating panel can be adapted for two phase or three phase systems. The heating panels are particularly useful for defining a heating cavity of an oven.