Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4879082 | Method for molding plastic material into disk shaped sabstrate for an optical information record carrier | Yoshihiro Shimizu | 1989-11-07 |
| 4798767 | Optical information record medium | Tokuei Aoki, Katsumi Kohno | 1989-01-17 |