A multi-stage electromagnetic interference suppression circuit is disclosed which utilizes a diverter network, an impedance network and a clamping network. The diverter network includes a series combination of a varistor and a three terminal gas arrester to suppress incoming transient energy in both...http://www.google.ca/patents/US5136455?utm_source=gb-gplus-sharePatent US5136455 - Electromagnetic interference suppression device
