Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D345557 | Telephone set | Masafuku Akatsu, Akira Abe, Hitoshi Tsuchida, Takeshi Nakatani | 1994-03-29 |
| D342252 | Telephone set | Masafuku Akatsu, Akira Abe, Hitoshi Tsuchida, Takeshi Nakatani | 1993-12-14 |
| D300926 | Key telephone set | Kenichi Morikawa, Masafuku Akatsu, Tatsuya Kato, Takeshi Nakatani | 1989-05-02 |
| D298938 | Key telephone set with speaker phone | Kenichi Morikawa, Masafuku Akatsu, Tatsuya Kato, Takeshi Nakatani | 1988-12-13 |
| D298939 | Key telephone set with speakerphone and visual display panel | Kenichi Morikawa, Masafuku Akatsu, Tatsuya Kato, Takeshi Nakatani | 1988-12-13 |