Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5621021 | Erasable writing ink composition | Koji Yoshioka, Yasuaki Ogiwara, Kyoko Kobayashi | 1997-04-15 |
| 5522922 | Aqueous ink composition | Kaname Masugi | 1996-06-04 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5621021 | Erasable writing ink composition | Koji Yoshioka, Yasuaki Ogiwara, Kyoko Kobayashi | 1997-04-15 |
| 5522922 | Aqueous ink composition | Kaname Masugi | 1996-06-04 |