A rotary cone drill bit (20 and 120)is provided with inserts (70 and 90) and compacts (50 and 150) having contoured cutting portions (66, 166, 72 and 92). The rotary cone drill bit (22 and 122) includes a bit body (26 and 126) having at least one downwardly extending arm (28) terminating in a spindle...http://www.google.ca/patents/US5709278?utm_source=gb-gplus-sharePatent US5709278 - Rotary cone drill bit with contoured inserts and compacts
