Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12202990 | Aqueous ink composition for ballpoint pen | Akiko HIRAYAMA, Takashi Hamazaki | 2025-01-21 |
| 12110401 | Aqueous ink composition for writing instrument | Akiko HIRAYAMA, Kana Miyoshi | 2024-10-08 |
| 11634601 | Aqueous ink composition for ballpoint pen | Akiko HIRAYAMA, Kana Miyoshi | 2023-04-25 |
| 11041081 | Aqueous ink composition for writing instrument | — | 2021-06-22 |
| 10851252 | Aqueous ink composition for writing instruments | Kana Miyoshi, Akiko HIRAYAMA | 2020-12-01 |
| 8900358 | Ink composition for water-based ballpoint pen | — | 2014-12-02 |