Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6334817 | Golf club head | Hiroyuki Ezawa, Toshiki Oonaka, Shingo Nomura, Takashi Iihara | 2002-01-01 |
| 5073338 | High strength steel bolts | Toyofumi Hasegawa, Takeshi Nakahara, Takehiko Kato | 1991-12-17 |
| 4432792 | Material for steel wool | Heijiro Kawakami, Toyofumi Hasegawa, Hitoshi Sato, Katsumasa Tanaka, Jiro Koarai | 1984-02-21 |
| 4431445 | Steel for machine construction having excellent cold forgeability and machinability | Hideo Takeshita, Tsuyoshi Kohoka, Jiro Koarai, Shuji Iwata | 1984-02-14 |