Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7381754 | Oil-based ink composition and uses thereof | Takayuki Ikai | 2008-06-03 |
| 6830611 | Oil-base ink composition, writing utensils and dyes to be used therein | Takayuki Ikai | 2004-12-14 |
| 6530708 | Ink follower composition for oil-based ballpoint pens | — | 2003-03-11 |