Issued Patents 2021
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11174539 | Steel material suitable for use in sour environment | Hiroki Kamitani, Atsushi Soma, Shinji Yoshida, Seiya OKADA | 2021-11-16 |
| 11155893 | Steel material suitable for use in sour environment | Shinji Yoshida, Atsushi Soma, Hiroki Kamitani | 2021-10-26 |
| 11078558 | Steel material, oil-well steel pipe, and method for producing steel material | Shinji Yoshida, Atsushi Soma, Hiroki Kamitani | 2021-08-03 |
| 11060160 | Low-alloy steel for oil well pipe and method of manufacturing low-alloy steel oil well pipe | Keiichi Kondo, Takanori Sato | 2021-07-13 |
| 10988819 | High-strength steel material and production method therefor | Shinji Yoshida | 2021-04-27 |