Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D1094487 | Drill bit cutter element | — | 2025-09-23 |
| D1068886 | Drill bit cutter element | — | 2025-04-01 |
| D1068885 | Drill bit cutter element | — | 2025-04-01 |
| 9574405 | Hybrid disc bit with optimized PDC cutter placement | Peter Thomas Cariveau, Zhehua Zhang | 2017-02-21 |
| 8955413 | Manufacturing methods for high shear roller cone bits | Rahul Bijai, Zhehua Zhang, Vikrant Bhadbhade | 2015-02-17 |
| 8672060 | High shear roller cone drill bits | Zhehua Zhang | 2014-03-18 |
| 8185365 | Radial force distributions in rock bits | Mohammed Boudrare, Sujian Huang | 2012-05-22 |
| 7681670 | Two-cone drill bit | James L. Larsen, Mohammed Boudrare | 2010-03-23 |
| 7549488 | Two-cone drill bit with enhanced stability | Mohammed Boudrare | 2009-06-23 |
| 7316281 | Two-cone drill bit with enhanced stability | Mohammed Boudrare | 2008-01-08 |