Issued Patents 2022
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11506311 | Threaded connection for steel pipe | Sadao Douchi | 2022-11-22 |
| 11415246 | Threaded joint for steel pipes | Yoshinori Ando, Shin Ugai | 2022-08-16 |
| 11391097 | Threaded connection for steel pipe | Sadao Douchi | 2022-07-19 |
| 11313181 | Threaded connection for steel pipe | Masaaki Sugino, Keita Inose | 2022-04-26 |