Issued Patents 2003
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6613135 | Pseudo-plastic water based ink for ballpoint pen | Shigeru Miyazaki, Yoji Takeuchi | 2003-09-02 |
| 6599352 | Water-based ink composition for writing instrument | Katsuhiko Shiraishi, Yoji Takeuchi, Tadashi Kamagata | 2003-07-29 |
| 6554890 | Water based ink composition for writing instrument | Tadashi Kamagata | 2003-04-29 |