Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4790885 | Method of producing high tensile-high toughness steel | Rikio Chijiiwa, Naoomi Yamada | 1988-12-13 |
| 4219371 | Process for producing high-tension bainitic steel having high-toughness and excellent weldability | Hajime Nakasugi, Hiroshi Tamehiro | 1980-08-26 |