Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6974509 | Brass | Koichi Hagiwara, Masaru Yamazaki, Yoshihiro Hirata, Mitsuhide Hirabayashi | 2005-12-13 |
| 6599378 | Copper-based alloy, method for production of the alloy, and products using the alloy | Koichi Hagiwara, Masaru Yamazaki, Yukihiro Hirata, Mitsuhide Hirabayashi | 2003-07-29 |
| 5498483 | Wear-resistant sintered ferrous alloy for valve seat | Yoshishige Takano | 1996-03-12 |
| 5427600 | Low alloy sintered steel and method of preparing the same | Yoshiaki Itoh, Yoshinobu Takeda | 1995-06-27 |