Issued Patents 2004
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6683956 | Encrypting conversion apparatus, decrypting conversion apparatus, cryptographic communication system, and electronic toll collection apparatus | Makoto Aikawa, Shigeru Hirahata, Kazuo Takaragi | 2004-01-27 |