Issued Patents All Time
Showing 26–44 of 44 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5787179 | Scrambling and descrambling of data with improved security | Kiyotaka Ogawa, Kiyoshi Kohiyama, Kiyokatsu Iijima | 1998-07-28 |
| 5784464 | System for and method of authenticating a client | Akio Munakata, Yuzuru Koga, Masayuki Ishizaki | 1998-07-21 |
| 5774651 | False statement detection system | Makoto Yoshioka | 1998-06-30 |
| 5768387 | Key authentication method and key authentication apparatus | Makoto Yoshioka | 1998-06-16 |
| 5737415 | Data management module, data reproduction management device and data reproduction management system | Makoto Yoshioka | 1998-04-07 |
| 5737413 | Information distribution system wherein storage medium storing ciphered information is distributed | Takayuki Hasebe, Makoto Yoshioka | 1998-04-07 |
| 5680453 | Software delivery system, center device, relaying device and user terminal device | Makoto Yoshioka | 1997-10-21 |
| 5623548 | Transformation pattern generating device and encryption function device | Naoya Torii, Noboru Iwayama, Kenichi Utsumi | 1997-04-22 |
| 5584022 | Enciphered file sharing method | Hiroaki Kikuchi, Naoya Torii, Takayuki Hasebe | 1996-12-10 |
| 5555304 | Storage medium for preventing an illegal use by a third party | Takayuki Hasebe, Makoto Yoshioka | 1996-09-10 |
| 5539825 | Electronic cashless transaction system | Takayuki Hasebe | 1996-07-23 |
| 5499299 | Modular arithmetic operation system | Masahiko Takenaka, Naoya Torii, Takayuki Hasebe | 1996-03-12 |
| 5440631 | Information distribution system wherein storage medium storing ciphered information is distributed | Takayuki Hasebe, Makoto Yoshioka | 1995-08-08 |
| 5428684 | Electronic cashless transaction system | Takayuki Hasebe | 1995-06-27 |
| 5392351 | Electronic data protection system | Takayuki Hasebe, Makoto Yoshioka | 1995-02-21 |
| 5386468 | Method of registering identification number in personal communication terminal | Toshihiro Yabe, Kazutoshi Motohashi | 1995-01-31 |
| 5325433 | Encryption communication system | Naoya Torii, Takayuki Hasebe | 1994-06-28 |
| 5065430 | Voice band splitting scrambler | Naoya Torii, Mitsuhiro Azuma | 1991-11-12 |
| 4959863 | Secret speech equipment | Mitsuhiro Azuma, Fumio Amano, Naoya Torii | 1990-09-25 |