Issued Patents 2002
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6464807 | Production method of ultra fine grain steel | Shiro Torizuka, Osamu Umezawa, Kotobu Nagai | 2002-10-15 |
| 6348108 | High toughness steel and a method for manufacturing the same | Satoru Yusa, Toshihiko Takahashi | 2002-02-19 |