Patent ID: 6994615
Filing Date: 2006-02-07
Classification: E21B

Abstract:
1. An abrasive tool insert, which comprises: a substrate having an inner face which has a center, and an annular face which has a periphery, said inner face sloping outwardly and downwardly from said center at an angle ranging from between about 5° and 15° from the horizontal, an annular face which surrounds said inner face, which annular face terminates at said periphery and which slopes downwardly and outwardly from said inner face at an angle of between about 20° and 75° from the horizontal; and a continuous abrasive layer having a center, a periphery forming a cutting edge, being integrally formed on said substrate, and defining an interface therebetween, and wherein the abrasive layer has a thickness of at least about 0.1 mm.