Issued Patents 2021
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11189441 | Key switch device | Kazuhira Izawa, Mamiko Naka, Kenshi Nagata | 2021-11-30 |
| 10998149 | Key switch | Kazuhira Izawa, Junichi Seto, Mamiko Naka | 2021-05-04 |
| 10915181 | Push button switch with operation unit latched to base | Kazuhira Izawa, Mamiko Naka, Kenshi Nagata | 2021-02-09 |