Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5681632 | Optical information recording medium | Hideki Kitaura, Takeo Ohta, Ken'ichi Nagata, Katsumi Kawahara, Noboru Yamada | 1997-10-28 |
| 5674649 | Method of recording information | Kazumi Yoshioka, Takeo Ohta, Hidemi Isomura | 1997-10-07 |
| 5665520 | Optical recording medium | Kazumi Yoshioka, Takeo Ohta, Hidemi Isomura | 1997-09-09 |