Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4871404 | Method for producing an optical information recording disk | Kunizoh Ogoshi, Fumio Matsui | 1989-10-03 |
| 4836890 | Method for producing optical information recording disk | Kunizho Ogoshi, Fumio Matsui | 1989-06-06 |
| 4812857 | Optical information record disk | Shuich Yanagisawa | 1989-03-14 |