A surface mount conductive polymer device includes a layer of conductive polymer material laminated between first and second metal foil electrodes. A thermal stress relief area is formed as an etched-out area in each of the electrodes. The etched-out areas are equal in surface area, and they are symmetrically...http://www.google.es/patents/US6380839?utm_source=gb-gplus-sharePatente US6380839 - Surface mount conductive polymer device
