Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889567 | High strength and high toughness steel bar, rod and wire and the process of producing the same | Tadayoshi Fujiwara, Yukio Yamaoka, Kazuichi Hamada, Yoshiro Yamada, Yasuhiro Oki +2 more | 1989-12-26 |
| 4800744 | Production of a taper rod | Heijiro Kawakami, Kozo Katsube, Mamoru Murahashi, Susumu Takada | 1989-01-31 |
| 4801106 | Coil of tapered wire | Heijiro Kawakami, Kozo Katsube, Mamoru Murahashi, Susumu Takada | 1989-01-31 |