Issued Patents All Time
Showing 51–63 of 63 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5796824 | Storage medium for preventing an irregular use by a third party | Takayuki Hasebe, Ryota Akiyama | 1998-08-18 |
| 5774651 | False statement detection system | Ryota Akiyama | 1998-06-30 |
| 5768387 | Key authentication method and key authentication apparatus | Ryota Akiyama | 1998-06-16 |
| 5737413 | Information distribution system wherein storage medium storing ciphered information is distributed | Ryota Akiyama, Takayuki Hasebe | 1998-04-07 |
| 5737415 | Data management module, data reproduction management device and data reproduction management system | Ryota Akiyama | 1998-04-07 |
| 5680453 | Software delivery system, center device, relaying device and user terminal device | Ryota Akiyama | 1997-10-21 |
| 5560724 | Keyboard having improved keytop | Seiichi Iwasa, Hideyuki Motoyama | 1996-10-01 |
| 5555304 | Storage medium for preventing an illegal use by a third party | Takayuki Hasebe, Ryota Akiyama | 1996-09-10 |
| 5553216 | Structured database system together with structure definition frame storing document body data | Hiroaki Negishi, Gengo Tazaki, John W. Mackin, Mitsuhiro Kokubun | 1996-09-03 |
| 5486059 | Keyboard having improved keytop | Seiichi Iwasa, Hideyuki Motoyama | 1996-01-23 |
| 5440631 | Information distribution system wherein storage medium storing ciphered information is distributed | Ryota Akiyama, Takayuki Hasebe | 1995-08-08 |
| 5392351 | Electronic data protection system | Takayuki Hasebe, Ryota Akiyama | 1995-02-21 |
| 4305445 | Large-sized pneumatic radial tires | Hiroshi Ogawa | 1981-12-15 |