Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4986938 | Process for producing plastic substrate for optical disks | Akihiro Izuka, Mitsuru Yamashita | 1991-01-22 |
| 4841501 | Plastic substrate for optical disk and process for producing the same | Akihiro Izuka, Mitsuru Yamashita | 1989-06-20 |
| 4764331 | Large diameter optical disk substrate made of polycarbonate | Shinji Tokuhara, Shuzo Iyoshi | 1988-08-16 |
| 4741689 | Injection mold for an optical disk | Yasushi Hiramatsu | 1988-05-03 |
| 4627809 | Metal mold and stamper for injection molding of a plastic disc for a high-density information recording carrier | Norio Okabayashi | 1986-12-09 |