Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7323434 | Electropositive production well treating fluid and method of preparing the same | Changming Su, Rushan Liu, Weiping Xu, Zengchen Guan, Peizhi Yu +5 more | 2008-01-29 |
| 7158886 | Automatic control system and method for bottom hole pressure in the underbalance drilling | Xutian Hou, Chunguo Yang, Bingtang Gao, Yijin Zeng, Jianlong Zhang | 2007-01-02 |