Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6949863 | Metal-graphite brush | Takayoshi Otani, Toshio Ishikawa, Mitsuo Ikeda, Yoichi Sakaura, Naoki Morita +4 more | 2005-09-27 |
| 6758881 | Metal-graphite brush and production method thereof | Takayoshi Otani, Mitsuo Ikeda, Yoichi Sakaura, Naoki Morita, Takahiro Sakamoto +5 more | 2004-07-06 |