Issued Patents 2003
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6659353 | Method of checking authenticity of sheet with built-in electronic circuit chip | Chikashi Okamoto, Kazutaka Tsuji, Mitsuo Usami, Chizuko Yasunobu, Asahiko Isobe +2 more | 2003-12-09 |
| 6606385 | Data encrypting/decrypting conversion methods and apparatuses and data communication system adopting the same | Makoto Aikawa, Hiroyuki Koreeda, Manabu Sasamoto, Hiroo Okamoto, Takaharu Noguchi +2 more | 2003-08-12 |
| 6592032 | Control system and method of controlling information written into storage media | Chikashi Okamoto | 2003-07-15 |
| 6504931 | Method and apparatus for encrypting data | Hiroshi Yoshiura, Mayuko Shimizu | 2003-01-07 |