Issued Patents All Time
Showing 51–64 of 64 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5832083 | Method and device for utilizing data content | Noboru Iwayama, Naoya Torii, Masahiko Takenaka, Masahiro Matsuda | 1998-11-03 |
| 5796824 | Storage medium for preventing an irregular use by a third party | Ryota Akiyama, Makoto Yoshioka | 1998-08-18 |
| 5761308 | System for refunding payment for software | Naoya Torii, Haruhiko Tsunoda, Masao Fujiwara | 1998-06-02 |
| 5761651 | Software charging system and software data utilization permitting device | Naoya Torii, Noboru Iwayama, Masahiko Takenaka, Masahiro Matsuda | 1998-06-02 |
| 5737413 | Information distribution system wherein storage medium storing ciphered information is distributed | Ryota Akiyama, Makoto Yoshioka | 1998-04-07 |
| 5621794 | Moving-picture encipherment method and system, and enciphered moving-picture decipherment method and system | Masahiro Matsuda, Naoya Torii, Noboru Iwayama, Masahiko Takenaka | 1997-04-15 |
| 5584022 | Enciphered file sharing method | Hiroaki Kikuchi, Ryota Akiyama, Naoya Torii | 1996-12-10 |
| 5555304 | Storage medium for preventing an illegal use by a third party | Ryota Akiyama, Makoto Yoshioka | 1996-09-10 |
| 5539825 | Electronic cashless transaction system | Ryota Akiyama | 1996-07-23 |
| 5499299 | Modular arithmetic operation system | Masahiko Takenaka, Naoya Torii, Ryota Akiyama | 1996-03-12 |
| 5440631 | Information distribution system wherein storage medium storing ciphered information is distributed | Ryota Akiyama, Makoto Yoshioka | 1995-08-08 |
| 5428684 | Electronic cashless transaction system | Ryota Akiyama | 1995-06-27 |
| 5392351 | Electronic data protection system | Ryota Akiyama, Makoto Yoshioka | 1995-02-21 |
| 5325433 | Encryption communication system | Naoya Torii, Ryota Akiyama | 1994-06-28 |