Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9873806 | Ink composition for aqueous ink ball point pen | Yusuke Kobayashi, Tomoyuki Akaki | 2018-01-23 |
| 9416286 | Ink composition for aqueous ballpoint pen | Yoji Takeuchi, Yusuke Kobayashi, Saki Hanatani | 2016-08-16 |