Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6541724 | Key switch | Zenzo Tozuka | 2003-04-01 |
| 5914468 | Keyboard unit and key switch | Takashi Nishimura, Toshimi Chiba, Sadao Tachibana, Zenzo Tozuka | 1999-06-22 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6541724 | Key switch | Zenzo Tozuka | 2003-04-01 |
| 5914468 | Keyboard unit and key switch | Takashi Nishimura, Toshimi Chiba, Sadao Tachibana, Zenzo Tozuka | 1999-06-22 |