Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5027337 | Optical recording medium and tracking method therefor | Shunzo Takahashi, Shigeru Izawa, Hidefumi Suzuki | 1991-06-25 |
| 4881214 | Data record formatting system and reading/writing system for optical recording medium | Shigeru Izawa | 1989-11-14 |