Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5109407 | Communication device connected to telephone line together with telephone set | Tsutomu Fujita, Yoshinobu Ido | 1992-04-28 |
| 5077784 | Visible telephone | Tsutomu Fujita, Takeshi Ban, Yoshinobu Ido, Masaaki Sugihara, Takashi Sugiyama +1 more | 1991-12-31 |