Issued Patents 2025
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12234699 | Inner tube assembly of drill tool and rope coring drill tool thereof | Xuyong Liu, Beihua Chen | 2025-02-25 |
| 12221859 | Ball-clamp type fall arrester for drill pipe | Xuyong Liu, Youlin Li | 2025-02-11 |