Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6589920 | Viscosity modifier for lubricating oil and lubricating oil composition | Keiji Okada | 2003-07-08 |
| 6525007 | Viscosity modifier for lubricating oil and lubricating oil composition | Keiji Okada | 2003-02-25 |