Issued Patents 2021
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11053749 | Threaded joint for oil well steel pipe | Takamasa Kawai, Masaki Yoshikawa, Jun Takano, Takuya Nagahama | 2021-07-06 |
| 10900595 | Threaded joint for oil well tubing | Takamasa Kawai, Masaki Yoshikawa, Haruhiko Seki, Masateru Ueta, Jun Takano +1 more | 2021-01-26 |