Issued Patents 2019
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10350770 | Pattern knife assembly | — | 2019-07-16 |
| 10287825 | Cutting elements having non-planar surfaces and downhole cutting tools using such cutting elements | Huimin Song, Liang Zhao, Youhe Zhang, Michael G. Azar, Xiaoge Gan +4 more | 2019-05-14 |
| 10267096 | Drill bit rolling element with retaining ring | Yuri Burhan, Jibin Shi, Youhe Zhang | 2019-04-23 |