Issued Patents 2005
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6898027 | Optical element and manufacturing method for same | Masahiro Yamada, Takakiyo Kanazawa, Tetsu Watanabe, Sunao Aoki | 2005-05-24 |
| 6839188 | Optical element and optical pickup | Masahiro Yamada | 2005-01-04 |