Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6765847 | Optical disk and method of magnetically separating tracks of the optical disk | Masahiro Birukawa, Yasumori Hino, Tomoyuki Hiroki | 2004-07-20 |
| 6690626 | Optical disk with magnetic layer separated magnetically between tracks and method of magnetically separating tracks of the optical disk | Masahiro Birukawa, Tomoyuki Hiroki | 2004-02-10 |