Issued Patents 2004
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6807133 | Optical head and optical disk apparatus | Mariko Umeda, Takeshi Shimano | 2004-10-19 |
| 6791934 | Objective lens optical system, optical head and optical information reproduction apparatus | Takeshi Shimano, Kazuo Shigematsu, Koichi Maruyama, Shuichi Takeuchi | 2004-09-14 |
| 6728197 | Optical disk having a plurality of information recording units | Harukazu Miyamoto, Takeshi Maeda, Toshimichi Shintani, Takahiro Kurokawa, Hirofumi Sukeda | 2004-04-27 |