Issued Patents All Time
Showing 26–30 of 30 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5446796 | Method and apparatus for settlement of accounts by IC cards | Ginya Ishiguro, Toshiyasu Muta, Kazutaka Sakita, Tatsuaki Okamoto, Atsushi Fujioka | 1995-08-29 |
| 5396558 | Method and apparatus for settlement of accounts by IC cards | Ginya Ishiguro, Toshiyasu Muta, Kazutaka Sakita, Tatsuaki Okamoto, Atsushi Fujioka | 1995-03-07 |
| 4850019 | Data randomization equipment | Akihiro Shimizu | 1989-07-18 |
| 4625076 | Signed document transmission system | Tatsuaki Okamoto, Akira Shiraishi, Tsukasa Kawaoka | 1986-11-25 |
| 4514592 | Cryptosystem | — | 1985-04-30 |