1
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.


2
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. ...


3
Yuelin Shen, Youhe Zhang, Zhou Yong, Jiaqing Yu, Madapusi K Keshavan: Rolling cutter. Smith International, Osha • Liang, April 27, 2010: US07703559 (52 worldwide citation)

A cutting element for a drill bit that includes an outer support element having at least a bottom portion and a side portion; and an inner rotatable cutting element. A portion of the inner rotatable cutting element is disposed in the outer support element, where the inner rotatable cutting element i ...


4
Anthony Griffo, Madapusi K Keshavan, Youhe Zhang, Yuelin Shen, Michael Janssen: Thermally stable ultra-hard material compact constructions. Smith International, Osha Liang, November 29, 2011: US08066087 (35 worldwide citation)

Thermally stable ultra-hard compact constructions comprise a polycrystalline diamond body substantially free of a catalyst material, and a substrate that is joined thereto. The substrate can be ceramic, metallic, cermet and combinations thereof, and can be joined to the body by a braze material or o ...


5
Youhe Zhang, Yuelin Shen: Methods of forming thermally stable polycrystalline diamond cutters. Smith International, Osha Liang, December 11, 2012: US08328891 (34 worldwide citation)

A method for forming a thermally stable cutting element that includes forming at least one acid infusion pathway in a polycrystalline abrasive body containing a catalyzing material to be leached; and contacting at least a portion of the at least one acid infusion pathway in the polycrystalline abras ...


6
Madapusi K Keshavan, Anthony Griffo, Yuelin Shen, Youhe Zhang: Polycrystalline diamond constructions having improved thermal stability. Smith International, Osha Liang, October 4, 2011: US08028771 (27 worldwide citation)

Polycrystalline diamond constructions include a diamond body comprising a matrix phase of bonded together diamond crystals formed at high pressure/high temperature conditions with a catalyst material. The sintered body is treated to remove the catalyst material disposed within interstitial regions, ...


7
Youhe Zhang, Yuelin Shen: Modified cutters and a method of drilling with modified cutters. Smith International, Christie Parker & Hale, July 20, 2010: US07757785 (20 worldwide citation)

A modified cutting element that includes a base portion, an ultrahard layer disposed on the base portion, and at least one modified region disposed adjacent to a cutting face of the cutter. In certain applications, the ultrahard layer includes thermally stable polycrystalline diamond.


8
Yuelin Shen, Youhe Zhang, Zhou Yong: Shaped cutter surface. Smith International, Christie Parker & Hale, September 21, 2010: US07798257 (19 worldwide citation)

A cutter for a drill bit used in a geological formation includes a shaped ultra hard working surface. The cutter with the shaped working surface is mounted on a drill bit to provide desired cutting characteristics. The shaped working surface provides varied cutting characteristics depending upon the ...


9
Yuelin Shen, Youhe Zhang, Zhou Yong, Jiaqing Yu, Madapusi K Keshavan: Rolling cutter. Smith International, Osha Liang, January 10, 2012: US08091655 (17 worldwide citation)

A cutting element for a drill bit that includes an outer support element having at least a bottom portion and a side portion; and an inner rotatable cutting element, a portion of which is disposed in the outer support element, wherein the inner rotatable cutting element includes a substrate and a di ...


10
Yuelin Shen, Youhe Zhang, Steffen S Kristiansen: Cutter having shaped working surface with varying edge chamfer. Smith International, Christie Parker & Hale, June 1, 2010: US07726420 (14 worldwide citation)

A cutter for a drill bit used for drilling wells in a geological formation includes an ultra hard working surface and a chamfer along an edge of the working surface, wherein the chamfer has a varied geometry along the edge. The average geometry of the chamfer varies with cutting depth. A depression ...