Issued Patents All Time
Showing 26–50 of 86 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10076824 | Polycrystalline diamond construction with controlled gradient metal content | Youhe Zhang, Guodong Zhan | 2018-09-18 |
| 9988853 | Retention of multiple rolling cutters | Peter Thomas Cariveau, Yuri Burhan | 2018-06-05 |
| 9776917 | Coating on PDC/TSP cutter for accelerated leaching | Ted Tessitore, Anthony Griffo, Youhe Zhang, Madapusi K. Keshavan | 2017-10-03 |
| 9739097 | Polycrystalline diamond compact cutters with conic shaped end | Youhe Zhang, Yuri Burhan, Jibin Shi | 2017-08-22 |
| 9683410 | Cutter assemblies, downhole tools incorporating such cutter assemblies and methods of making such downhole tools | Youhe Zhang, Yuri Burhan, Gregory T. Lockwood | 2017-06-20 |
| 9482056 | Solid PCD cutter | Ronald K. Eyre, John Daniel Belnap, Youhe Zhang, Jibin Shi, Yuri Burhan | 2016-11-01 |
| 9322219 | Rolling cutter using pin, ball or extrusion on the bit body as attachment methods | Yuri Burhan, Youhe Zhang | 2016-04-26 |
| 9297211 | Polycrystalline diamond construction with controlled gradient metal content | Youhe Zhang, Guodong Zhan | 2016-03-29 |
| 9291000 | Rolling cutter with improved rolling efficiency | Youhe Zhang, Yuri Burhan, Kjell Haugvaldstad | 2016-03-22 |
| 9187962 | Methods of attaching rolling cutters in fixed cutter bits using sleeve, compression spring, and/or pin(s)/ball(s) | Yuri Burhan, Jiaqing Yu, Jonan Fulenchek, Youhe Zhang | 2015-11-17 |
| RE45748 | Modified cutters and a method of drilling with modified cutters | Youhe Zhang | 2015-10-13 |
| 9145743 | Cutting elements having cutting edges with continuous varying radii and bits incorporating the same | Youhe Zhang, Michael Janssen | 2015-09-29 |
| 9115553 | 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 | 2015-08-25 |
| 9103169 | Fixed cutter bit partial blade connection at bit center | Youhe Zhang, Paul Higgins | 2015-08-11 |
| 9097074 | Polycrystalline diamond composites | Youhe Zhang, Sujian Huang, Madapusi K. Keshavan | 2015-08-04 |
| 9033070 | Rolling cutter | Youhe Zhang, Zhou Yong, Jiaqing Yu, Madapusi K. Keshavan | 2015-05-19 |
| 9022148 | Diamond bonded construction comprising multi-sintered polycrystalline diamond | Youhe Zhang | 2015-05-05 |
| 8991523 | Rolling cutter assembled directly to the bit pockets | Youhe Zhang, Yuri Burhan, Michael A. Siracki, Mahavir Nagaraj, Bala Durairajan +2 more | 2015-03-31 |
| 8925656 | Diamond bonded construction with reattached diamond body | Youhe Zhang | 2015-01-06 |
| 8925422 | Method of manufacturing a drill bit | Gregory T. Lockwood, Youhe Zhang | 2015-01-06 |
| 8881849 | Rolling cutter bit design | Youhe Zhang | 2014-11-11 |
| 8875813 | Atomic layer deposition nanocoatings on cutting tool powder materials | Guodong Zhan, Youhe Zhang, Feng Yu, Xian Yao, J. Daniel Belnap +1 more | 2014-11-04 |
| 8869919 | Drag bit with utility blades | Youhe Zhang, Bala Durairajan, Charles H. S. Douglas, III | 2014-10-28 |
| 8852546 | Polycrystalline diamond materials having improved abrasion resistance, thermal stability and impact resistance | Madapusi K. Keshavan, Youhe Zhang, Anthony Griffo, Michael Janssen | 2014-10-07 |
| 8800691 | Rolling cutter | Youhe Zhang, Zhou Yong, Jiaqing Yu, Madapusi K. Keshavan | 2014-08-12 |