Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9103168 | Scraping-wheel drill bit | Ying Xin Yang, Lian Chen, Zhu Pei, Hai Tao Ren | 2015-08-11 |
| 8985243 | Composite drill bit | Ying Xin Yang, Lian Chen, Zhu Pei, Hai Tao Ren | 2015-03-24 |