Issued Patents 2020
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10597760 | High-strength steel material for oil well and oil well pipes | Kenji Kobayashi | 2020-03-24 |
| 10557574 | Ni—Cr alloy material and seamless oil country tubular goods using the same | Masayuki Sagara | 2020-02-11 |