Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6248287 | Corrective tempering apparatus for rolling elements | Kiyoshi Hirakawa, Akitoshi Maeda, Hiroaki Sugiyama | 2001-06-19 |
| 6093268 | Corrective tempering method for rolling elements | Kiyoshi Hirakawa, Akitoshi Maeda, Hiroaki Sugiyama | 2000-07-25 |