Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8691739 | Lubricating oil composition | Yasuharu Yokoyama, Satoshi Ogano | 2014-04-08 |
| 7399736 | Low viscosity, high abrasion resistance engine oil composition | Yosuharu Yokoyama, Hiroyuki Iwasaki | 2008-07-15 |