Issued Patents 2021
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11174539 | Steel material suitable for use in sour environment | Atsushi Soma, Shinji Yoshida, Yuji Arai, Seiya OKADA | 2021-11-16 |
| 11155893 | Steel material suitable for use in sour environment | Shinji Yoshida, Yuji Arai, Atsushi Soma | 2021-10-26 |
| 11078558 | Steel material, oil-well steel pipe, and method for producing steel material | Yuji Arai, Shinji Yoshida, Atsushi Soma | 2021-08-03 |
| 11066718 | Method of manufacturing stainless pipe for oil wells and stainless steel pipe for oil wells | Taro OE | 2021-07-20 |