Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4852161 | Echo canceller using an echo path status detection | — | 1989-07-25 |
| 4658420 | Tone responsible disabler circuit for an echo canceller | Yuzo Fukushi | 1987-04-14 |
| 4447138 | Objective system for video disc | Takahiro Sugiyama | 1984-05-08 |
| 4389100 | Objective system for video disc | Takahiro Sugiyama | 1983-06-21 |