Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4847132 | Protective layer for optical information recording medium | Masatoshi Takao, Kunio Kimura, Toshimitsu Kurumizawa | 1989-07-11 |
| 4839883 | Optical information recording medium | Noboru Yamada | 1989-06-13 |