1
Madapusi K Keshavan, Monte E Russell, Dah Ben Liang: Drill bit inserts enhanced with polycrystalline diamond. Smith International, Christie Parker & Hale, December 6, 1994: US05370195 (198 worldwide citation)

A drill bit has means at one end for connecting the bit to a drill string and a plurality of inserts at the other end for crushing the rock to be drilled. The inserts have a cemented tungsten carbide body partially embedded in the drill bit and at least two layers at the protruding drilling portion ...


2
Graham Mensa Wilmot, Ghanshyam Rai, Madapusi K Keshavan, David Truax, Kuttaripalayam T Kembaiyan: Surface enhanced polycrystalline diamond composite cutters. Smith International, Christie Parker & Hale, November 10, 1998: US05833021 (109 worldwide citation)

A polycrystalline diamond cutter having a coating of refractory material applied to the polycrystalline diamond surface increases the operational life of the cutter. The coating typically has a thickness in the range of from 0.1 to 30 .mu.m and may be made from titanium nitride, titanium carbide, ti ...


3
Madapusi K Keshavan, Kuttaripalayam T Kembaiyan, Wayne C Quantz, Robert C Tucker Jr, Melvin D Mendenhall, Jean M Quets: High performance overlay for rock drilling bits. Smith International, Robert G Upton, July 16, 1996: US05535838 (100 worldwide citation)

A method to apply a high performance overlay to a metal substrate of a rock bit to render the substrate surfaces of the rock bit more resistant to erosion, corrosion and substrate cracking while performing in an earthen formation is described. The method comprises the steps of bombarding the surface ...


4
Youhe Zhang, Yuelin Shen, Madapusi K Keshavan, Mike Azar: Thermally stable polycrystalline diamond cutting elements and bits incorporating the same. Smith International, Christie Parker & Hale, May 19, 2009: US07533740 (98 worldwide citation)

Cutting elements are provided having substrates including end surfaces. TSP material layers extend over only a portion of the end surfaces or extend into the substrates below the end surfaces. Bits incorporating such cutting elements are also provided.


5
Madapusi K Keshavan, Youhe Zhang, Yuelin Shen, Anthony Griffo, Michael Janssen: Polycrystalline diamond materials having improved abrasion resistance, thermal stability and impact resistance. Smith International, Connolly Bove Lodge & Hutz, February 24, 2009: US07493973 (94 worldwide citation)

PCD materials comprise a diamond body having bonded diamond crystals and interstitial regions disposed among the crystals. The diamond body is formed from diamond grains and a catalyst material at high pressure/high temperature conditions. The diamond grains have an average particle size of about 0. ...


6
Madapusi K Keshavan, Proserfina C Rey: Composite cemented carbide. Smith International, Christie Parker & Hale, January 14, 1997: US05593474 (94 worldwide citation)

A composite material is disclosed along with the method of making the same. The material comprises a tough grade of cemented carbide granule dispersed with a hard brittle grade of cemented carbide granules to form a matrix. The quantity of hard, brittle cemented carbide granules is between 20% to 60 ...


7
Ronald K Eyre, Madapusi K Keshavan: Method for forming a non-uniform interface adjacent ultra hard material. Smith International, Christie Parker & Hale, February 27, 2001: US06193001 (93 worldwide citation)

A non-uniform interface is formed between a polycrystalline ultra hard material layer and a cemented tungsten carbide substrate, or a polycrystalline ultra hard material layer and a transition layer, or a transition layer and a substrate of a cutting element. A first sheet made from an intermediate ...


8
Ronald K Eyre, Madapusi K Keshavan: Cutting element having a substrate, a transition layer and an ultra hard material layer. Smith International, Christie Parker & Hale, May 17, 2005: US06892836 (79 worldwide citation)

A non-uniform interface is formed between a polycrystalline ultra hard material layer and a cemented tungsten carbide substrate, or a polycrystalline ultra hard material layer and a transition layer, or a transition layer and a substrate of a cutting element. A first sheet made from an intermediate ...


9
Madapusi K Keshavan, Anthony Griffo, David Truax, Dah Ben Liang: Coarse carbide substrate cutting elements and method of forming the same. Smith International, Christie Parker & Hale, March 28, 2006: US07017677 (72 worldwide citation)

Cutting elements having coarse grain substrates and ultra hard material layers are provided. The substrates are formed from coarse grain size particles of tungsten carbide. A method of forming such cutting elements and a drag bit incorporating such cutting elements are also provided.


10
James L Larsen, Michael A Siracki, Thomas W Oldham, Madapusi K Keshavan: Composite nozzles for rock bits. Smith International, Robert G Upton, February 27, 1996: US05494122 (65 worldwide citation)

A composite mini-extended nozzle is disclosed that is designed to both resist erosion and be strong enough to withstand the shock of a downhole drilling environment. In addition, means are provided to shroud at least a portion of the extended nozzle to further protect a portion of the nozzle nearest ...