Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10516407 | Signal processing device | — | 2019-12-24 |
| 7759978 | Current driver circuit | Kumiko Noguchi | 2010-07-20 |
| 7274630 | Layer discriminating focus control apparatus, optical disk apparatus, and methods therefore | Sumitaka Maruyama, Masahiko Tanaka, Hideaki Ohsawa, Akihito Ogawa, Kazuto Kuroda | 2007-09-25 |
| 7224653 | Optical disk unit capable of restraining changes in light quantity | Shintaro Takehara, Katsuo Iwata, Sumitaka Maruyama | 2007-05-29 |
| 6937544 | Optical disk unit for recording or reproducing information | Shintaro Takehara, Katsuo Iwata, Sumitaka Maruyama | 2005-08-30 |
| 6925046 | Optical head device and optical disk unit capable of stable signal reproduction | Katsuo Iwata, Shintaro Takehara, Sumitaka Maruyama | 2005-08-02 |
| 6781928 | Optical head and optical disk apparatus | Katsuo Iwata, Shintaro Takehara, Sumitaka Maruyama | 2004-08-24 |
| 6504800 | Optical disk and optical apparatus | Shintaro Takehara | 2003-01-07 |
| 6459670 | Optical information recording method and optical information recording device | Hiroshi Hasegawa | 2002-10-01 |