Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7158886 | Automatic control system and method for bottom hole pressure in the underbalance drilling | Xutian Hou, Chunguo Yang, Yijin Zeng, Caixuan Guo, Jianlong Zhang | 2007-01-02 |