Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6563068 | Dome-shaped contact plate giving crispy feeling of click and sheet with contact plate | Katsuaki Shimatani | 2003-05-13 |
| 6548779 | Sheet having moving contacts and sheet switch | Katsutoshi Takahashi, Naoya Iwama | 2003-04-15 |