Issued Patents All Time
Showing 51–75 of 86 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8752656 | Method of designing a bottom hole assembly and a bottom hole assembly | Youhe Zhang, Madapusi K. Keshavan, Peter Thomas Cariveau | 2014-06-17 |
| 8727043 | Cutter assemblies, downhole tools incorporating such cutter assemblies and methods of making such downhole tools | Youhe Zhang, Yuri Burhan, Gregory T. Lockwood | 2014-05-20 |
| 8702825 | Composite cutter substrate to mitigate residual stress | Youhe Zhang, Jibin Shi, Yuri Burhan, Gregory T. Lockwood | 2014-04-22 |
| 8617274 | Pulsed electrical field assisted or spark plasma sintered polycrystalline ultra hard material and thermally stable ultra hard material cutting elements and compacts and methods of forming the same | Guodong Zhan, Youhe Zhang | 2013-12-31 |
| 8590130 | Cutting elements with re-processed thermally stable polycrystalline diamond cutting layers, bits incorporating the same, and methods of making the same | Youhe Zhang, Madapusi K. Keshavan | 2013-11-26 |
| 8567531 | Cutting elements, methods for manufacturing such cutting elements, and tools incorporating such cutting elements | J. Daniel Belnap, Georgiy Voronin, Feng Yu, Peter Thomas Cariveau, Youhe Zhang +1 more | 2013-10-29 |
| 8567534 | Thermally stable polycrystalline diamond cutting elements and bits incorporating the same | Youhe Zhang, Madapusi K. Keshavan, Michael G. Azar | 2013-10-29 |
| 8499860 | Cutting elements having cutting edges with continuous varying radii and bits incorporating the same | Youhe Zhang, Michael Janssen | 2013-08-06 |
| 8413746 | Rolling cutter | Youhe Zhang, Zhou Yong, Jiaqing Yu, Madapusi K. Keshavan | 2013-04-09 |
| 8360176 | Brazing methods for PDC cutters | Youhe Zhang, Hong Deng | 2013-01-29 |
| 8347990 | Matrix bit bodies with multiple matrix materials | Gregory T. Lockwood, Youhe Zhang | 2013-01-08 |
| 8328891 | Methods of forming thermally stable polycrystalline diamond cutters | Youhe Zhang | 2012-12-11 |
| 8322467 | Cutting element having stress reduced interface | John (Youhe) Zhang | 2012-12-04 |
| 8309050 | Polycrystalline diamond materials having improved abrasion resistance, thermal stability and impact resistance | Madapusi K. Keshavan, Youhe Zhang, Anthony Griffo, Michael Janssen | 2012-11-13 |
| 8157029 | Thermally stable polycrystalline diamond cutting elements and bits incorporating the same | Youhe Zhang, Madapusi K. Keshavan, Michael G. Azar | 2012-04-17 |
| 8113303 | Modified cutters and a method of drilling with modified cutters | Youhe Zhang | 2012-02-14 |
| 8096372 | Cutter geometry for increased bit life and bits incorporating the same | Youhe Zhang, Sujian Huang, Peter Thomas Cariveau | 2012-01-17 |
| 8091655 | Rolling cutter | Youhe Zhang, Zhou Yong, Jiaqing Yu, Madapusi K. Keshavan | 2012-01-10 |
| 8066087 | Thermally stable ultra-hard material compact constructions | Anthony Griffo, Madapusi K. Keshavan, Youhe Zhang, Michael Janssen | 2011-11-29 |
| 8037951 | Cutter having shaped working surface with varying edge chamfer | Youhe Zhang, Steffen S. Kristiansen | 2011-10-18 |
| 8028771 | Polycrystalline diamond constructions having improved thermal stability | Madapusi K. Keshavan, Anthony Griffo, Youhe Zhang | 2011-10-04 |
| 7946363 | Thermally stable polycrystalline diamond cutting elements and bits incorporating the same | Youhe Zhang, Madapusi K. Keshavan, Michael G. Azar | 2011-05-24 |
| 7926596 | Drag bit with utility blades | Youhe Zhang | 2011-04-19 |
| 7878275 | Matrix bit bodies with multiple matrix materials | Gregory T. Lockwood, Youhe Zhang | 2011-02-01 |
| 7861808 | Cutter for maintaining edge sharpness | Youhe Zhang | 2011-01-04 |