Issued Patents All Time
Showing 1–18 of 18 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6310953 | Subscriber circuit | Kazuhiro Yoshida | 2001-10-30 |
| 6005933 | Method for communication with no power feed and exchange for realizing the method | — | 1999-12-21 |
| 5402482 | Ring trip deciding circuit | Kazuyuki Minohara | 1995-03-28 |
| 5402485 | Two-wire termination impedance generation circuit of subscriber circuit | Kazuhiro Yoshida, Kazuyuki Minohara, Yoshinobu IMAI, Takeshi Nishioka | 1995-03-28 |
| 5347577 | Battery feed circuit for supplying feed current to telephone set | Kazuhiro Yoshida, Kazuyuki Minohara | 1994-09-13 |
| 5335271 | Ring trip detection circuit | Kazumi Kinoshita, Kiyoshi Kurosaki, Taichi Kosako, Kazuyuki Minohara | 1994-08-02 |
| 5311518 | ISDN interface circuit and system using the same | Yozo Iketani, Takashi Sato, Hiroyuki Ujiie, Seiji Miyoshi | 1994-05-10 |
| 5128992 | Hybrid circuit | Toshiro Tojo, Yuzo Yamamoto | 1992-07-07 |
| 5113426 | Ground fault detector | Kazumi Kinoshita, Toshiro Tojo | 1992-05-12 |
| 4995111 | Ring trip circuit for subscriber telephone | Toshiro Tojo, Kazumi Kinoshita, Yuzo Yamamoto, Yozo Iketani, Shin Ito | 1991-02-19 |
| 4982422 | Terminating circuit in a battery feed circuit of an electronic exchange system | Shin Itoh, Yozo Iketani, Yuzo Yamamoto | 1991-01-01 |
| 4935960 | Battery feed circuit | Toshiro Tojo, Kazumi Kinoshita, Yuzo Yamamoto | 1990-06-19 |
| 4912429 | Operational amplifier | Toshiro Tojo, Kazumi Kinoshita, Yuzo Yamamoto | 1990-03-27 |
| 4862309 | Protection circuit for battery feed circuit | Toshiro Tojo, Kazumi Kinoshita, Yuzo Yamamoto | 1989-08-29 |
| 4827505 | Subscriber line interface circuit | Toshiro Tojo, Yozo Iketani, Mitsutoshi Ayano, Kiyoshi Shibuya | 1989-05-02 |
| 4827503 | Integrated ringing circuit and a ring trip circuit for the same | Kazumi Kinoshita, Toshiro Tojo, Yuzo Yamamoto | 1989-05-02 |
| 4748659 | Calling signal transmission apparatus | Kiyoshi Kasahara, Kenichi Ogawa, Shoji Nojiri, Yoshimi Iijima, Yasuo Miyazaki +3 more | 1988-05-31 |
| 4631366 | Battery feed circuit for subscriber line | Mitsutoshi Ayano, Kiyoshi Shibuya, Yoshimi Iijima, Atsuo Serikawa | 1986-12-23 |