Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11697743 | Ink composition, writing instrument and method for producing ink composition | Sachiko Onuki, Haruka Takai, Hiroyuki Saitou | 2023-07-11 |
| 8771410 | Ink for ballpoint pens and ballpoint pen using same | Aya Otsubo, Ikuo Takagishi, Hiroki Kimura, Takashi Sekine | 2014-07-08 |