Patent ID: 6446739
Filing Date: 2002-09-10
Classification: E21B

Abstract:
A drill bit for boring a bore hole in an earthen formation, comprising:a bit body having a pin end, a cutting end and a longitudinal axis and including at least two legs extending from said cutting end, each of said legs including a leading side surface, a trailing side surface, and a shoulder, each of said legs further including a bearing and a cutter cone rotatably supported on said bearing; said bit body further including a fluid flow system, including a flowway in said pin end, said flowway being in fluid communication with at least one exit port in said cutting end; said bit body further including a neck between said shoulders and said pin end and a hard, wear-resistant material on at least a portion of said neck; and wherein said hard, wear-resistant material extends radially from said neck to a distance less than full gage of the drill bit.