Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12110401 | Aqueous ink composition for writing instrument | Kousuke OGURA, Akiko HIRAYAMA | 2024-10-08 |
| 11634601 | Aqueous ink composition for ballpoint pen | Akiko HIRAYAMA, Kousuke OGURA | 2023-04-25 |
| 10851252 | Aqueous ink composition for writing instruments | Kousuke OGURA, Akiko HIRAYAMA | 2020-12-01 |