Issued Patents 2004
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6827767 | Ink for ball-point pen and ball-point pen | Masaru Miyamoto, Youji Takeuchi | 2004-12-07 |
| 6818047 | Ink for ball pen and ball pen | Masaru Miyamoto, Youji Takeuchi | 2004-11-16 |
| 6776829 | Water-based ink composition for writing utensil | Masaru Miyamoto, Tadashi Kamagata, Yoji Takeuchi | 2004-08-17 |