Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4839208 | Optical information recording medium | Katsuji Nakagawa, Masaki Itoh, Mitsuru Sakai | 1989-06-13 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4839208 | Optical information recording medium | Katsuji Nakagawa, Masaki Itoh, Mitsuru Sakai | 1989-06-13 |