Issued Patents 2004
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6751166 | Phase error detection method for magnetic wall displacement type of magneto-optical recording device | Tetsuhiro Sakamoto, Minoru Tobita | 2004-06-15 |
| 6731589 | Substrate for optical recording media, optical recording medium, manufacturing process for optical recording media, and optical recording/reproducing method | Tetsuhiro Sakamoto | 2004-05-04 |
| 6678223 | Frequency demodulating circuit, optical disk apparatus thereof and preformating device | Minoru Tobita, Susumu Tosaka, Yoshikatsu Niwa, Shinichi Nakao | 2004-01-13 |