Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6249532 | Interactive chargeable communication system with billing system therefor | Kazuhiko Yoshikawa, Hitoaki Owashi, Hiroyuki Hayakawa, Kyoichi Hosokawa | 2001-06-19 |
| 6002694 | Interactive chargeable communication system with billing system therefor | Kazuhiko YOSHIZAWA, Hitoaki Owashi, Hiroyuki Hayakawa, Kyoichi Hosokawa | 1999-12-14 |
| 5307171 | Video tape recorder/player | Nobuo Azuma, Yoshizumi Watatani, Atsushi Yoshioka, Shuichi Matsuo | 1994-04-26 |
| 5122885 | Magnetic video recording/reproducing apparatus for video signals of different aspect ratios adapter unit | Atsushi Yoshioka, Yoshizumi Watatani, Nobuo Azuma, Shuichi Matsuo | 1992-06-16 |