Patent ID: 8448725

Claim:
A drill bit for drilling in an earthen formation, comprising: a drill bit body having a face end, a connection end, and a longitudinal axis; at least one of a first type of cutting element mounted to said face end of said drill bit body, said first type of cutting element having a first grain size, a first backrake, a first bevel size, and a cutting face for cutting a swath through the formation; at least one of a second type of cutting element having a cutting face and being mounted to said face end of said drill bit body at substantially a same radial distance from said longitudinal axis as said first type of cutting element such that the cutting face of the second type of cutting element is disposed in the swath cut by the cutting face of the first type of cutting element when the drill bit is rotated about the longitudinal axis, said second type of cutting element having a second grain size, a second backrake, a second bevel size; wherein said bevel size for said second type of cutting element is different than for said first type of cutting element; and at least one of the following is true: said second type of cutting element is made from a material having a different impact resistance than is said first type of cutting element; said backrake angle for said second type of cutting element is different than for said first type of cutting element.