Issued Patents 2021
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11174539 | Steel material suitable for use in sour environment | Hiroki Kamitani, Shinji Yoshida, Yuji Arai, Seiya OKADA | 2021-11-16 |
| 11155893 | Steel material suitable for use in sour environment | Shinji Yoshida, Yuji Arai, Hiroki Kamitani | 2021-10-26 |
| 11078558 | Steel material, oil-well steel pipe, and method for producing steel material | Yuji Arai, Shinji Yoshida, Hiroki Kamitani | 2021-08-03 |