Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6631106 | Spare area with a predetermined capacity for a detective sector allocated in each zone | Takehiko Numata, Mineo Moribe, Atsushi Takeuchi | 2003-10-07 |
| 5667862 | Magneto-optical disk | Yasuaki Nakane, Shuichi Igarashi, Sakuya Tamada, Susumu Sakamoto | 1997-09-16 |
| 4646188 | VTR tape cassette | Shinichiro Kato, Tadao Igarashi | 1987-02-24 |