Issued Patents 2022
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11519049 | Low temperature resistant oil casing having high strength and high toughness, and manufacturing method thereof | Wen Sun, Zhonghua Zhang | 2022-12-06 |
| 11459643 | High-strength and high-toughness perforating gun tube and manufacturing method therefor | Zhonghua Zhang, Cunyao Zhao | 2022-10-04 |