Issued Patents 2003
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6624941 | Diffraction optical element | Koichi Maruyama | 2003-09-23 |
| 6624942 | Objective lens for optical pick-up | Koichi Maruyama | 2003-09-23 |
| 6574876 | Apparatus for detecting rotational angle | — | 2003-06-10 |
| 6555808 | Apparatus for detecting rotational angle | Kouichi Ohno | 2003-04-29 |
| 6515955 | Objective optical system for optical pick-up | — | 2003-02-04 |