Issued Patents 2019
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10406870 | Automatic locking device for snow skid chains | Lijun Chen | 2019-09-10 |
| 10196863 | Connection structure between pipe body and steel joint of aluminum alloy drill pipe | Xiaojun Li, Chun FENG, Fangpo Li | 2019-02-05 |
| 10184596 | Connection structure between pipe body and joint of aluminum alloy drill pipe | Fangpo Li, Qi Shi, Chun FENG | 2019-01-22 |