Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5444785 | Echo attaching circuit and audio device using the same | Shigeyoshi Hayashi, Jun Hirai | 1995-08-22 |
| 5394474 | Echo attaching circuit and audio device using the same | Jun Hirai | 1995-02-28 |