A unitized polycrystalline composite diamond stud type drag bit cutter having no high temperature braze of a PDC wafer to a carbide stud is disclosed. The diamond cutting surface may be planar, convex, curved or a truncated cone. The unitized construction of the cutter eliminates the problems associated...http://www.google.es/patents/US5379853?utm_source=gb-gplus-sharePatente US5379853 - Diamond drag bit cutting elements
