An electrical device which contains a first electrode, a second electrode, a third electrode, a first resistor which is connected in series between the first and second electrodes, and a second resistor which (i) is thermally coupled to the first resistor, (ii) exhibits anomalous resistance/temperature...http://www.google.es/patents/US6392528?utm_source=gb-gplus-sharePatente US6392528 - Circuit protection devices
