Issued Patents All Time
Showing 1–15 of 15 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5048091 | Talker speech level control circuit for telephone transmitter by piezoelectric conversion | Takeshi Horiuchi | 1991-09-10 |
| 4996710 | Side-tone adjusting system and method for key telephone system establishing a plurel kinds of speaking paths | Toshiaki Takahashi | 1991-02-26 |
| 4932043 | Apparatus for controlling key telephone station set in key telephone system | Yasunobu Nakayama | 1990-06-05 |
| 4893331 | System allowing selective connection of various types of external apparatuses to telephone set | Takeshi Horiuchi, Yasuo Funato | 1990-01-09 |
| 4856058 | Office line interface circuits | Fumio Hino | 1989-08-08 |
| 4815127 | Communication system using unbalanced communication paths | Yoshihiro Akita | 1989-03-21 |
| 4764954 | Automatic gain control in a loudspeaker telephone set | Masayuki Tsurusaki, Takeshi Horiuchi, Hisashi Yamada, Minoru Tanaka, Akira Maekawa | 1988-08-16 |
| 4645882 | Latching relay drive circuit for use in telephone sets | Yasunobu Nakayama | 1987-02-24 |
| 4636588 | Electric source circuit for telephone sets | Yasunobu Nakayama | 1987-01-13 |
| 4567326 | Telephone apparatus for selective operation in a normal and repertory dial mode | Takao Yamamoto, Yoshikazu Sano, Yasunobu Nakayama | 1986-01-28 |
| 4564724 | Terminal interface connecting terminal unit having central office line interface to key telephone system | Yasunobu Nakayama, Shinichi Shibata | 1986-01-14 |
| 4532378 | Telephone apparatus capable of inputting character data | Yasunobu Nakayama, Takeshi Kunii | 1985-07-30 |
| 4511764 | Telephonic display device | Yasunobu Nakayama, Takeshi Kunii | 1985-04-16 |
| 4491693 | Key telephone system and method of setting operating data in the key telephone system | Yoshikazu Sano, Hideyasu Mori | 1985-01-01 |
| 4184054 | Key telephone system | Shin-ichi Shibata, Yoshikazu Sano, Takao Yamamoto | 1980-01-15 |