Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5171903 | Lubricating oil composition | Saburo Koyama, Kenji Onodera, Shigeo Hara, Yasunori Tomari, Toshio Saito +1 more | 1992-12-15 |
| 5072067 | Lubricating oil composition | Saburo Koyama, Kenji Onodera, Shigeo Hara | 1991-12-10 |
| 4832860 | Lubricating oil for metal working | Tadashi Katafuchi, Hiroo Mitazaki, Yasunori Tomari, Kenji Onodera | 1989-05-23 |