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Hisashi Toyoshima
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Hachioji-shi, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Method and system for recovering the validity of cryptographically...
Patent number
7,694,126
Issue date
Apr 6, 2010
Hitachi, Ltd.
Kunihiko Miyazaki
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Method for communication
Patent number
7,406,528
Issue date
Jul 29, 2008
Hitachi, Ltd.
Chikako Kurita
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Trusted computer system
Patent number
7,210,043
Issue date
Apr 24, 2007
Hitachi, Ltd.
Kunihiko Miyazaki
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Time stamp generating system
Patent number
7,200,682
Issue date
Apr 3, 2007
Hitachi, Ltd.
Kunihiko Miyazaki
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Method and system for recovering the validity of cryptographically...
Patent number
7,134,021
Issue date
Nov 7, 2006
Hitachi, Ltd.
Kunihiko Miyazaki
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Method of information display and communication system using the me...
Patent number
7,010,569
Issue date
Mar 7, 2006
Hitachi, Ltd.
Satoe Okayasu
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Digital data authentication method
Patent number
6,499,105
Issue date
Dec 24, 2002
Hitachi, Ltd.
Hiroshi Yoshiura
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Digital data authentication method
Patent number
6,131,162
Issue date
Oct 10, 2000
Hitachi Ltd.
Hiroshi Yoshiura
G06 - COMPUTING CALCULATING COUNTING
Patents Applications
last 30 patents
Information
Patent Application
Digital image data authenticity assuring method, and digital image...
Publication number
20060117183
Publication date
Jun 1, 2006
Yasuo Hatano
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Application
Method and system for recovering the validity of cryptographically...
Publication number
20060059357
Publication date
Mar 16, 2006
Hitachi, Ltd
Kunihiko Miyazaki
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Application
Digital data authentication method
Publication number
20050182939
Publication date
Aug 18, 2005
Hiroshi Yoshiura
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Application
Time stamp generating system
Publication number
20030212828
Publication date
Nov 13, 2003
Kunihiko Miyazaki
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Application
Method for communication
Publication number
20030103603
Publication date
Jun 5, 2003
Chikako Kurita
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Application
System and method for authentication
Publication number
20030084294
Publication date
May 1, 2003
Hirokazu Aoshima
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Application
Trusted computer system
Publication number
20020174369
Publication date
Nov 21, 2002
Hitachi, Ltd
Kunihiko Miyazaki
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Application
Digital signature or electronic seal authentication system and reco...
Publication number
20020129255
Publication date
Sep 12, 2002
Chikako Tsuchiyama
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Application
Digital data authentication method
Publication number
20020095579
Publication date
Jul 18, 2002
Hiroshi Yoshiura
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Application
Method of managing an electronic mark using an agent
Publication number
20020038423
Publication date
Mar 28, 2002
Kenichi Shouduka
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Application
Method and system for recovering the validity of cryptographically...
Publication number
20020023221
Publication date
Feb 21, 2002
Kunihiko Miyazaki
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Application
Data display method and system
Publication number
20020002682
Publication date
Jan 3, 2002
Chikako Tsuchiyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Method of information display and communication system using the me...
Publication number
20010056468
Publication date
Dec 27, 2001
Satoe Okayasu
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Method of detecting changed contents
Publication number
20010027450
Publication date
Oct 4, 2001
Takashi Shinoda
G06 - COMPUTING CALCULATING COUNTING