Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5696063 | Basic metal salt of dithiocarbamic acid and lubricating oil composition containing said salt | Hirotaka Tomizawa, Katsuya Arai | 1997-12-09 |
| 4968453 | Synthetic lubricating oil composition | Sadao Wada, Kenyu Akiyama | 1990-11-06 |
| 4871476 | Synthetic lubricating fluid | Narihiko Yoshimura, Tetsuo Ishii | 1989-10-03 |
| 4719025 | Synthetic lubrication oil compositions | Kenyu Akiyama, Sadao Wada | 1988-01-12 |
| 4608173 | Filter | Koh Watanabe, Sadao Wada | 1986-08-26 |