Issued Patents 1982
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4363006 | Noise reduction system having series connected variable frequency filters | Yukinobu Ishigaki | 1982-12-07 |
| 4363007 | Noise reduction system having series connected low and high frequency emphasis and de-emphasis filters | Yukinobu Ishigaki, Kaoru Totsuka, Takao Kawasaki | 1982-12-07 |
| 4359605 | Monaural signal to artificial stereo signals convertings and processing circuit for headphones | Mitsuru Kikuchi | 1982-11-16 |