Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6656887 | Lubricating oil compositions | Kazuhiro Yagishita, Takeo Koizumi | 2003-12-02 |
| 6642189 | Engine oil compositions | Isao Kurihara, Kiyoshi Inoue | 2003-11-04 |
| 6627583 | Engine oil composition | Kiyoshi Inoue, Mituaki Ishimaru, Mineo Kagaya, Masakuni Hirata | 2003-09-30 |
| 6569819 | Lubricant compositions | Kazuhiro Yagishita, Osamu Kurosawa | 2003-05-27 |
| 5912212 | Lubricating oil composition | Yoko Matsuyama, Yutaka Shikatani, Toshio Yoshida | 1999-06-15 |
| 5780399 | Oil-soluble polyester, additive for lubricating oil, and lubricating oil composition | Yoshihide Ishikawa, Shinsuke Hasegawa, Michio Miyamoto, Shizuo Kitahara, Yutaka Shikatani | 1998-07-14 |
| 5658865 | Oxidation-inhibitive lubricating oil composition | Toshio Yoshida, Yoko Matsuyama | 1997-08-19 |
| 5658866 | Lubricating oil compositions | Toshio Yoshida, Yoko Matsuyama | 1997-08-19 |
| 5372703 | Lubricating oils | Kouzou Kamiya, Isao Honjo, Toshio Yoshida, Masaru Ushio, Masakuni Hirata +4 more | 1994-12-13 |
| 5281347 | Lubricating composition for internal combustion engine | Masakuni Hirata | 1994-01-25 |
| 4992150 | Process for preparing oil-soluble nitrogen-containing compounds | Harumichi Watanabe | 1991-02-12 |