Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6599352 | Water-based ink composition for writing instrument | Masaru Miyamoto, Yoji Takeuchi, Tadashi Kamagata | 2003-07-29 |
| 6521035 | Ink follow up composition for water-base ball pen | — | 2003-02-18 |