Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4449106 | Noise reducing apparatus | Yukinobu Ishigaki, Yutaka Haramoto | 1984-05-15 |
| 4412097 | Variable-directivity microphone device | Yukinobu Ishigaki, Makoto Yamamoto, Naotaka Miyaji | 1983-10-25 |
| 4399327 | Variable directional microphone system | Makoto Yamamoto, Naotaka Miyaji, Yukinobu Ishigaki | 1983-08-16 |
| 4363007 | Noise reduction system having series connected low and high frequency emphasis and de-emphasis filters | Yutaka Haramoto, Yukinobu Ishigaki, Takao Kawasaki | 1982-12-07 |
| 4354059 | Variable-directivity microphone device | Yukinobu Ishigaki, Makoto Yamamoto, Naotaka Miyaji | 1982-10-12 |