Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5679386 | Optical disk formation member for making an optical disk substrate | Masahiro Birukawa, Yoshihiko Kudoh | 1997-10-21 |
| 5656370 | Optical recording medium | Masahiro Birukawa | 1997-08-12 |