Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6613135 | Pseudo-plastic water based ink for ballpoint pen | Masaru Miyamoto, Yoji Takeuchi | 2003-09-02 |
| 6605143 | Water based ink composition for writing instrument | Yoji Takeuchi | 2003-08-12 |