Patent ID: 8047309

Claim:
An earth-boring tool, comprising: a body comprising a face at a distal end thereof and gage regions defining an outer diameter and comprising longitudinally upward extensions of a plurality of blades having a plurality of cutting elements fixedly attached thereto at the face and a shank secured to the body; at least one transition surface comprising a chamfer positioned between the outer diameter at an uppermost end of an associated gage region and the shank; and a plurality of up-drill features comprising elongated structures disposed on and attached to the at least one transition surface and extending from a position adjacent to a transition edge between the at least one transition surface and the associated gage region, the plurality of up-drill features positioned to be passive during down drilling and positioned and structured to actively engage and cut formation material during up drilling or back reaming, wherein a radially outermost surface of the at least one up-drill feature is flush with the outer diameter of the body and wherein a radially outermost edge of the at least one up-drill feature is flush with the transition edge, at least one up-drill feature of the plurality of up-drill features comprising at least one of a different thickness and a different shape from at least another up-drill feature of the plurality of up-drill features before being deployed in a borehole.