Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11965389 | Patching construction method using a hydraulic variable-grade expansion tool for blocking during drilling | Xiaohua Zhu, Feilong Cheng | 2024-04-23 |
| 11846138 | Hydraulic oscillation tool with variable stage, small pressure drop and strong impact based on radio frequency identification | Xiaohua Zhu, Feilong Cheng | 2023-12-19 |