Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4882722 | Front loading disk player | Nobuyuki Isobe, Masao Kase | 1989-11-21 |
| 4845700 | Front loading disc player | Toshiaki Koizumi, Masao Kase, Masatsugu Otaki, Masakazu Yamashita, Kenji Tanaka | 1989-07-04 |
| 4840932 | Catalyst for producing 1,4-naphthoquinone | Shigeyuki Yoshimura, Yasuo Asanuma, Katsuaki Nasu, Haruo Yoshizumi, Kazumi Tsujimoto +1 more | 1989-06-20 |