This invention relates to a temperature indicating device for pots and to a device-pot combination comprising a sensor and an indicator circuit for the temperature internally attained by the pot, characterized in that the temperature sensor is a part of the pot and the latter is thermally connected by...http://www.google.com.au/patents/US4509868?utm_source=gb-gplus-sharePatent US4509868 - Temperature indicating device for a cooking pot and device-pot combination
