Issued Patents 2004
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6819646 | Optical pickup, optical information recording/reproducing apparatus using the same, and phase variable wave plate used in the pickup and the apparatus | Yasuo Kitaoka, Ken'ichi Kasazumi, Katsuhiko Kumagawa, Kazuhisa Yamamoto | 2004-11-16 |