Issued Patents 1997
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5617393 | Optical disk having an erased-state indicator and optical disk apparatus for reducing frequency of disk erasing operation | Satoshi Itami, Masaru Nakahara, Hiroshi Suzuki, Kenichi Utsumi | 1997-04-01 |