Issued Patents 2005
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6901042 | Optical disc, having a certification pit for certifying that data recording thereon is original | Takashi Yumiba, Keiichi Kawashima | 2005-05-31 |
| 6891788 | Optical disk, and method and apparatus for reproducing information recorded in optical disk | Takashi Yumiba, Teruyuki Takizawa, Mitsuro Moriya, Mitsuaki Oshima, Akihiko Nishioka | 2005-05-10 |