Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE48843 | Rolling bearing and spindle apparatus for machine tool | Naoki Matsuyama, Sumio Sugita, Yu Koiwa, Takaaki Anzai, Masaru Terasaki | 2021-12-07 |
| 6742934 | Rolling bearing and spindle apparatus for machine tool | Naoki Matsuyama, Sumio Sugita, Yu Koiwa, Takaaki Anzai, Masaru Terasaki | 2004-06-01 |
| 6733181 | Bearing unit | Yu Koiwa, Naoki Matsuyama | 2004-05-11 |
| 6443623 | Lubrication system for rolling bearing | Sumio Sugita, Yu Koiwa | 2002-09-03 |