Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5022068 | Branched telephone system | Keiko Shimada | 1991-06-04 |
| 4955055 | Loudspeaking telephone with a frequency shifting circuit | Keiko Shimada | 1990-09-04 |
| 4853953 | Voice controlled dialer with separate memories for any users and authorized users | — | 1989-08-01 |
| 4716584 | Noise-free terminal station compatible with existing master stations | — | 1987-12-29 |
| 4513177 | Loudspeaking telephone system | Masakazu Nishino | 1985-04-23 |
| 4218665 | Band-pass filter | — | 1980-08-19 |