Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11787225 | Erasing tool | Ryosuke Matsushima | 2023-10-17 |
| 11207913 | Erasing member and erasing tool using the same | Toshimi Kamitani, Yosuke Setagawa, Hitoshi Kino, Tooru Nakajima | 2021-12-28 |
| 11179962 | Pencil lead | Hiroyuki Arai | 2021-11-23 |
| 9896591 | Pencil lead | Hiroyuki Arai | 2018-02-20 |
| 9856387 | Color pencil lead | — | 2018-01-02 |
| 9636940 | Writing instrument | Toshimi Kamitani, Yoshiharu Namiki, Yosuke Setagawa, Hitoshi Kino, Tooru Nakajima +1 more | 2017-05-02 |
| 8349063 | Pencil lead and production process for the same | Katsunori Kitazawa | 2013-01-08 |