Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7521491 | Oil-based ink composition for ballpoint pen and ball-point pen using oil-based ink | Shuji Ichikawa | 2009-04-21 |
| 7462229 | Oil-based ink composition for ballpoint pen using oil-based ink | Shuji Ichikawa | 2008-12-09 |