Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6599352 | Water-based ink composition for writing instrument | Masaru Miyamoto, Katsuhiko Shiraishi, Yoji Takeuchi | 2003-07-29 |
| 6554890 | Water based ink composition for writing instrument | Masaru Miyamoto | 2003-04-29 |