Issued Patents 2018
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9988857 | Method for manufacturing superior 13Cr friction-welded drillrod | Peng Zhao, Changfu Dong | 2018-06-05 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9988857 | Method for manufacturing superior 13Cr friction-welded drillrod | Peng Zhao, Changfu Dong | 2018-06-05 |