Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11662834 | Electronic erasing device and writing information processing system | Ryoji Kamiyama, Toshihiko Horie, Masamitsu Ito, Shigeru Yamashita | 2023-05-30 |
| 11385725 | Electronic erasing device and writing information processing system | Ryoji Kamiyama, Toshihiko Horie, Masamitsu Ito, Shigeru Yamashita | 2022-07-12 |