Issued Patents 2004
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6769917 | Method for indicating defective part in educational material and apparatus for indicating defective part in educational material | Akio Fujino, Hiroshi Kuzumaki, Shunichi Kamikawa, Hitoshi Ozawa | 2004-08-03 |
| 6755662 | Method for presenting most suitable question and apparatus for presenting most suitable question | Akio Fujino, Hiroshi Kuzumaki, Shunichi Kamikawa, Hitoshi Ozawa | 2004-06-29 |
| 6673146 | Method of manufacturing a magnet-free faraday rotator | Kazushi Shirai | 2004-01-06 |