Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7138978 | Key input device | — | 2006-11-21 |
| 6103346 | Sheet-like key top and its manufacturing method | Masaru Nakajo, Satoshi Kudo | 2000-08-15 |
| 5720472 | Short-stroke dome-shaped disc film spring | — | 1998-02-24 |