Issued Patents 2023
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11746597 | Pressured horizontal directional drilling continuous coring device for engineering geological investigation | Cong Zeng, Peng Zhang | 2023-09-05 |
| 11643895 | Sealed pressured horizontal directional drilling continuous coring device for engineering geological investigation | Cong Zeng, Peng Zhang | 2023-05-09 |
| 11585174 | Hydraulic propulsion horizontal directional coring device | Cong Zeng, Peng Zhang | 2023-02-21 |