Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5060222 | Method of overwriting information on recording medium | Mitsuru Sawano, Toshiaki Igata | 1991-10-22 |
| 4883741 | Information recording medium | Takayuki Kuriyama | 1989-11-28 |
| 4788097 | Information recording medium | Shinichiro Ohara, Masao Yabe | 1988-11-29 |
| 4731620 | Information recording medium | Masao Yabe | 1988-03-15 |