Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8270816 | Information recording and/or playback apparatus | Toshiya Mizushima, Yasunori Ohara, Keiji Nagayama | 2012-09-18 |
| 7885515 | Recording/reproducing device and recording/reproduction method | Keiji Nagayama | 2011-02-08 |