Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 |