Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4864637 | FMX stereophonic broadcast receiver | Tsutomu Ishikawa, Noboru Usui, Kanji Tanaka, Ryuichi Ogawa, Masashi Arai | 1989-09-05 |
| 4852167 | FMX stereophonic receiver | Noboru Usui, Kanji Tanaka, Ryuichi Ogawa, Tsutomu Ishikawa, Masashi Arai | 1989-07-25 |
| 4809328 | FM/FMX stereophonic receiver | Noboru Usui, Kanji Tanaka, Ryuichi Ogawa, Tsutomu Ishikawa, Masashi Arai | 1989-02-28 |