Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7047238 | Document retrieval method and document retrieval system | Katsumi Tada | 2006-05-16 |
| 7010519 | Method and system for expanding document retrieval information | Katsumi Tada, Naohiro Koizumi | 2006-03-07 |