A drill bit (100) for drilling a wellbore that traverses subterranean formations includes a drill bit body (106) having a plurality of journal pins (112), each having a bearing surface (128), and a rotary cutter (104) rotatably mounted on each journal pin (112), each rotary cutter (104) including a bearing...http://www.google.es/patents/USRE40197?utm_source=gb-gplus-sharePatente USRE40197 - Drill bit having an improved seal and lubrication method using same
Drill bit having an improved seal and lubrication method using same
