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Yoko Kumagai
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Kawasaki, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Method, product and apparatus for accelerating public-key certifica...
Patent number
8,516,245
Issue date
Aug 20, 2013
Hitachi, Ltd.
Yoko Kumagai
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Method and apparatus for accelerating public-key certificate valida...
Patent number
7,558,952
Issue date
Jul 7, 2009
Hitachi, Ltd.
Yoko Kumagai
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Digital-signed digital document exchange supporting method and info...
Patent number
7,533,269
Issue date
May 12, 2009
Hitachi, Ltd.
Yoko Kumagai
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Certificate validity authentication method and apparatus
Patent number
7,409,551
Issue date
Aug 5, 2008
Hitachi, Ltd.
Takahiro Fujishiro
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Public key certificate generation method, validation method and app...
Patent number
7,409,553
Issue date
Aug 5, 2008
Hitachi, Ltd.
Yoko Kumagai
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Authentication and authorization infrastructure system with CRL iss...
Patent number
7,392,380
Issue date
Jun 24, 2008
Hitachi, Ltd.
Tadashi Kaji
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Certificate validity authentication method and apparatus
Patent number
7,080,251
Issue date
Jul 18, 2006
Hitachi, Ltd.
Takahiro Fujishiro
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Patents Applications
last 30 patents
Information
Patent Application
METHOD AND APPARATUS FOR EVALUATING DEGREE OF GLYCATION OF PROTEIN
Publication number
20240053352
Publication date
Feb 15, 2024
PROVIGATE INC.
Norikazu KATAYAMA
G01 - MEASURING TESTING
Information
Patent Application
DATA ANALYSIS SYSTEM AND DATA ANALYSIS METHOD
Publication number
20220382711
Publication date
Dec 1, 2022
Hitachi, Ltd
Yoko KUMAGAI
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Application
Information Recommendation System and Method for Recommending Info...
Publication number
20210326315
Publication date
Oct 21, 2021
Hitachi, Ltd
Anirban BASU
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Application
METHOD, PRODUCT AND APPARATUS FOR ACCELERATING PUBLIC-KEY CERTIFICA...
Publication number
20090259842
Publication date
Oct 15, 2009
Hitachi, Ltd
Yoko KUMAGAI
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Certificate validity authentication method and apparatus
Publication number
20060242413
Publication date
Oct 26, 2006
Takahiro Fujishiro
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Digital-signed digital document exchange supporting method and info...
Publication number
20060168650
Publication date
Jul 27, 2006
Yoko Kumagai
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Application
Method and apparatus for accelerating public-key certificate valida...
Publication number
20050081037
Publication date
Apr 14, 2005
Yoko Kumagai
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Electronic document management system with the use of signature tec...
Publication number
20040255116
Publication date
Dec 16, 2004
Shingo Hane
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Authentication and authorization infrastructure system with CRL iss...
Publication number
20040111609
Publication date
Jun 10, 2004
Tadashi Kaji
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Public key certificate generation method, validation method and app...
Publication number
20030097566
Publication date
May 22, 2003
Yoko Kumagai
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Application
Certificate validity authentication method and apparatus
Publication number
20020046340
Publication date
Apr 18, 2002
Takahiro Fujishiro
H04 - ELECTRIC COMMUNICATION TECHNIQUE