Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8337642 | Spring steel with improved hardenability and pitting resistance | Tatsuo Fukuzumi, Motoyuki Sato, Ryo Hara | 2012-12-25 |
| 8197614 | Spring steel with improved hardenability and pitting resistance | Tatsuo Fukuzumi, Motoyuki Sato, Ryo Hara | 2012-06-12 |
| 7850794 | Spring steel with improved hardenability and pitting resistance | Tatsuo Fukuzumi, Motoyuki Sato, Ryo Hara | 2010-12-14 |
| 6322747 | High-strength spring steel | Tatsuo Fukuzumi, Motoyuki Satoh, Ryo Hara | 2001-11-27 |