Patent ID: 9140072
Filing Date: 2015-09-22
Classification: E21B

Abstract:
1. A cutting element for an earth-boring tool, comprising: a substrate; a polycrystalline table comprising superhard material secured to the substrate at an end of the substrate; and a non-planar interface defined between the polycrystalline table and the substrate, the non-planar interface comprising a cross-shaped groove extending into one of the substrate and the polycrystalline table to a first maximum elevation of the non-planar interface along a central axis of the substrate, an intersection between arms of the cross-shaped groove being aligned with the central axis of the substrate, and L-shaped grooves extending into the other of the substrate and the polycrystalline table proximate corners of the cross-shaped groove to a second, opposing maximum elevation of the non-planar interface along the central axis of the substrate, each L-shaped groove being defined by intersecting arms, the arms separating a surface of the non-planar interface from the cross-shaped groove, wherein an elevation of the surface along the central axis of the substrate is between the first maximum elevation to which the cross-shaped groove extends and the second maximum elevation to which the L-shaped grooves extend, and wherein transitions between surfaces defining the non-planar interface are rounded.