Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11293231 | Multi-path combined high-low voltage plasma drilling method, drill bit for drilling and drill bit apparatus for drilling | Yonghong Liu, Qiang Sun, Qingyun Li, Renjie Ji, Baoping Cai +5 more | 2022-04-05 |
| 11268326 | Multi-path combined high-low voltage plasma drilling power source and drillling system | Yonghong Liu, Qiang Sun, Qingyun Li, Renjie Ji, Baoping Cai +5 more | 2022-03-08 |
| 11085245 | Multi-path combined high-low voltage plasma rock-breaking drill bit, drill bit apparatus and drilling method | Yonghong Liu, Qiang Sun, Qingyun Li, Renjie Ji, Baoping Cai +5 more | 2021-08-10 |