U.S. Philips Corporation

Ronald Wijnsema

Johan Pragt

A heating element comprises a thermally conductive substrate, an electrically insulating layer provided over the substrate, and a heating track deposited on the insulating layer. The heating element has a dished portion defining a concave face on one side of the element, the insulating layer and the heating track being provided on the concave face. The heating element is suitable for a range of liquid heating applications, including electric kettles.

Heating element

Apparatus (1a, 1b) for heating liquids has a receptacle (10)for receiving liquid to be heated, a heating element (30) in the form of a support (31) having an electrically insulating surface (32b) carrying a resistive track (33) for heating liquid within the receptacle (10) and a control arrangement (40) for controlling the supply of power to the heating element (30). The control arrangement (40) includes a detector (41) for detecting deflection of the heating element (30). during operation of the apparatus and for reducing the power supply to the heating element (30) when the deflection of the heating element (30) exceeds a predetermined amount so providing a simple, efficient way of switching off the apparatus if the heating element (30) overhears due to, for example, the apparatus being boiled dry or the vessel (2a, 2b) being tilted to expose the heating element out of the liquid being heated.

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Growingen, Netherlands

Ronald Wijnsema