Issued Patents 2017
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9540881 | Method and system for improving drilling speed by using drill speed vibration | Zhichuan Guan, Yongwang Liu, Wenzhong Wei, Yucai Shi, Hongning Zhang | 2017-01-10 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9540881 | Method and system for improving drilling speed by using drill speed vibration | Zhichuan Guan, Yongwang Liu, Wenzhong Wei, Yucai Shi, Hongning Zhang | 2017-01-10 |