A sparkplug having ground and center electrodes that include a firing tip formed from a noble metal or noble metal alloy by reflowing of a noble metal preform. The present invention also includes a method of manufacturing a metal electrode having an ignition tip for an ignition device, including forming...http://www.google.fr/patents/US7385339?utm_source=gb-gplus-shareBrevet US7385339 - Ignition device having a reflowed firing tip and method of making
Ignition device having a reflowed firing tip and method of making
