Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8460483 | Method for heat treatment of coiled spring | Takashi Yajima, Hideki Okada, Takeshi FURUSE | 2013-06-11 |
| 5258082 | High strength spring | Hiroshi Koyama, Yasuo Sato, Akira Tange, Tadayoshi Akutsu | 1993-11-02 |
| 5225008 | Method for manufacturing a high-strength spring | Hiroshi Koyama, Yasuo Sato, Akira Tange, Tadayoshi Akutsu | 1993-07-06 |