Strix Limited

Keith Barrie Doyle

John Crawshaw Taylor

An electrical resistance or heater includes an electrical resistive track provided on an insulating substrate. Two predetermined sections of the track have a predetermined current carrying capacity and are bridged by a glass, ceramic, or glass ceramic material. The configuration of the track and the glass material are such that at a predetermined temperature, the leakage current between the track sections rises to the extent that it causes a current to flow through one or both of the sections which is substantially above its current carrying capability, whereby one section fails.

Resistive heating track with bridge fuse

Liquid heating vessels

The base (10) of a plastics liquid heating vessel (2) is formed by a heated stainless steel plate having a peripheral channel (16) engaging over a bead (32) lower end portion (22) of the vessel wall. A silicone rubber sealing ring (19) is clamped between two vessel wall and the channel.

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Tetbury, United Kingdom

Keith Barrie Doyle