Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5674649 | Method of recording information | Tetsuya Akiyama, Takeo Ohta, Hidemi Isomura | 1997-10-07 |
| 5665520 | Optical recording medium | Tetsuya Akiyama, Takeo Ohta, Hidemi Isomura | 1997-09-09 |