Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5788923 | Bearing steel | Ryoji Hayashi, Yasuo Murakami | 1998-08-04 |
| 5013525 | Steel for corrosion-resistant rolling part and rolling part | Kazuichi Tsubota, Tomoki Muraoka | 1991-05-07 |