Issued Patents All Time
Showing 1–16 of 16 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7770009 | Digital signing method | Kunihiko Miyazaki, Ryoichi Sasaki, Kazuo Takaragi, Toshiyuki Moritsu, Mizuhiro Sakai +2 more | 2010-08-03 |
| 7694126 | Method and system for recovering the validity of cryptographically signed digital data | Kunihiko Miyazaki, Hiroshi Yoshiura, Ryoichi Sasaki, Kazuo Takaragi, Hisashi Toyoshima +1 more | 2010-04-06 |
| 7526645 | Electronic document authenticity assurance method and electronic document disclosure system | Kunihiko Miyazaki, Mitsuru Iwamura, Tsutomu Matsumoto, Ryoichi Sasaki, Hiroshi Yoshiura +3 more | 2009-04-28 |
| 7386722 | Certificate management system and method | Katsuyuki Umezawa, Hiroki Uchiyama, Toshiomi Kodama | 2008-06-10 |
| 7357313 | Information processor-based service providing system and method | Hiroki Uchiyama, Katsuyuki Umezawa, Kenzi Matsumoto | 2008-04-15 |
| 7305558 | Digital signing method | Kunihiko Miyazaki, Ryoichi Sasaki, Kazuo Takaragi, Toshiyuki Moritsu, Mizuhiro Sakai +2 more | 2007-12-04 |
| 7200682 | Time stamp generating system | Kunihiko Miyazaki, Kazuo Takaragi, Hiroshi Yoshiura, Takeshi Matsuki, Hisashi Toyoshima +3 more | 2007-04-03 |
| 7134021 | Method and system for recovering the validity of cryptographically signed digital data | Kunihiko Miyazaki, Hiroshi Yoshiura, Ryoichi Sasaki, Kazuo Takaragi, Hisashi Toyoshima +1 more | 2006-11-07 |
| 6816969 | Digital signature generating method and digital signature verifying method | Kunihiko Miyazaki, Ryoichi Sasaki, Kazuo Takaragi, Hisanori Mishima, Takeshi Matsuki +3 more | 2004-11-09 |
| 6499105 | Digital data authentication method | Hiroshi Yoshiura, Kazuo Takaragi, Ryoichi Sasaki, Hisashi Toyoshima, Tsukasa Saito | 2002-12-24 |
| 6327658 | Distributed object system and service supply method therein | Katsuyuki Umezawa, Tadashi Kaji, Satoru Tezuka, Ryoichi Sasaki, Kuniaki Tabata +2 more | 2001-12-04 |
| 6253322 | Electronic certification authentication method and system | Yasuhiko Mizuno, Miwa Takahashi, Satoshi Mitsunaga, Shoji MORIYAMA | 2001-06-26 |
| 6189032 | Client-server system for controlling access rights to certain services by a user of a client terminal | Hisashi Umeki, Katsuyuki Umezawa, Seiji Miyazaki, Kazuo Matsunaga, Makoto Kitagawa | 2001-02-13 |
| 6131162 | Digital data authentication method | Hiroshi Yoshiura, Kazuo Takaragi, Ryoichi Sasaki, Hisashi Toyoshima, Tsukasa Saito | 2000-10-10 |
| 5465299 | Electronic document processing system and method of forming digital signature | Hiroshi Matsumoto, Kazuo Takaragi, Hiroyuki Maezawa, Shinobu Koizumi | 1995-11-07 |
| 5309516 | Group cipher communication method and group cipher communication system | Kazuo Takaragi, Hiroshi Matsumoto, Tsutomu Nakamura | 1994-05-03 |