Patent ID: 6315067
Filing Date: 2001-11-13
Classification: E21B

Abstract:
A cutter having a front surface defining a cutter face, said cutter comprising:a disc shaped body having an interface surface on one side bounded by an outer perimeter edge;said interface surface including a peripheral annular ring surface portion defined between the outer perimeter edge and an inner raised circular edge spaced radially inward from the perimeter edge, a protrusion surface portion inside the peripheral annular ring surface portion, and a plurality of finger-shaped slots formed in the protrusion surface portion to extend radially inward from the inner raised circular edge and create a series of ridges between the slots;said peripheral annular ring surface portion being disposed a distance (x) below the uppermost level of the protrusion surface portion and the slots being of a given height (h) below the uppermost level of the protrusion surface portion, which is less than the distance (x) of the peripheral annular ring surface portion, so as to define the inner raised circular edge;said peripheral annular ring surface portion being of radial width (y) established by the inward spacing of the inner raised circular edge from the outer perimeter edge;each of said slots also has a given width dimension (w) and a given depth dimension (d), such that slot width (w) is 25% to 200% of the radial width (y) of the peripheral annular ring surface portion; anda superabrasive material bonded to said body at said interface surface to create a cutting surface on said front cutter face having a greater thickness of said superabrasive material over the peripheral annular ring surface portion and over each radial slot.