Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6633631 | Digital key telephone system and extension terminal device thereof | Toshiaki Tanaka, Hiroshi Mano, Setsuo Kimura, Yoshihito Nagano, Masayuki Tsurusaki +4 more | 2003-10-14 |
| 6496576 | Digital key telephone system and extension terminal device thereof | Toshiaki Tanaka, Hiroshi Mano, Setsuo Kimura, Yoshihito Nagano, Masayuki Tsurusaki +4 more | 2002-12-17 |
| 6456705 | Digital key telephone system and extension terminal device thereof | Toshiaki Tanaka, Hiroshi Mano, Setsuo Kimura, Yoshihito Nagano, Masayuki Tsurusaki +4 more | 2002-09-24 |
| 6408060 | Digital key telephone system and extension terminal device thereof | Toshiaki Tanaka, Hiroshi Mano, Setsuo Kimura, Yoshihito Nagano, Masayuki Tsurusaki +4 more | 2002-06-18 |
| 6377671 | Digital key telephone system and extension terminal device thereof | Toshiaki Tanaka, Hiroshi Mano, Setsuo Kimura, Yoshihito Nagano, Masayuki Tsurusaki +4 more | 2002-04-23 |
| 6373924 | Digital key telephone system and extension terminal device thereof | Toshiaki Tanaka, Hiroshi Mano, Setsuo Kimura, Yoshihito Nagano, Masayuki Tsurusaki +4 more | 2002-04-16 |
| 6263061 | Digital button telephone system and extension terminal for the same | Toshiaki Tanaka, Hiroshi Mano, Setsuo Kimura, Yoshihito Nagano, Masayuki Tsurusaki +4 more | 2001-07-17 |
| 6118863 | Exchanging apparatus and control method for exchanging and connecting destination terminal and calling terminal, and communication terminal apparatus communicating with other terminals through communication network and control method | Takashi Aoki | 2000-09-12 |
| 5513256 | Key telephone system | — | 1996-04-30 |
| 5224159 | Key telephone system provided with telephone sets connectable to add-on modules | — | 1993-06-29 |
| 4650932 | Key telephone system | Yoshikazu Sano | 1987-03-17 |
| 4605825 | Function key assignments in a key telephone system | Yoshikazu Sano, Shinichi Shibata | 1986-08-12 |
| 4559417 | Method of setting operating data in a key telephone system | Hideyasu Mori, Yoshikazu Sano | 1985-12-17 |