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Kei Karasawa
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Tokyo, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Certificate authenticating method, certificate issuing device, and...
Patent number
8,775,796
Issue date
Jul 8, 2014
Nippon Telegraph and Telephone Corporation
Kei Karasawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
User authentication system and method for the same
Patent number
8,595,816
Issue date
Nov 26, 2013
Nippon Telegraph and Telephone Corporation
Kei Karasawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Client device, key device, service providing apparatus, user authen...
Patent number
8,352,743
Issue date
Jan 8, 2013
Nippon Telegraph and Telephone Corporation
Yukio Tsuruoka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Common key setting method, relay apparatus, and program
Patent number
8,291,231
Issue date
Oct 16, 2012
Nippon Telegraph and Telephone Corporation
Nachi Ueno
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
User authentication system for providing online services based on t...
Patent number
7,861,288
Issue date
Dec 28, 2010
Nippon Telegraph and Telephone Corporation
Yukio Tsuruoka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Packet encryption substituting device, method thereof, and program...
Patent number
7,539,858
Issue date
May 26, 2009
Nippon Telegraph and Telephone Corporation
Kei Karasawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Patents Applications
last 30 patents
Information
Patent Application
CERTIFICATE AUTHENTICATING METHOD, CERTIFICATE ISSUING DEVICE, AND...
Publication number
20110185171
Publication date
Jul 28, 2011
Nippon Telegraph and Telephone Corp.
Kei Karasawa
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Application
USER AUTHENTICATION SYSTEM AND METHOD FOR THE SAME
Publication number
20110047373
Publication date
Feb 24, 2011
Nippon Telegraph and Telephone Corporation
Kei Karasawa
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Application
COMMON KEY SETTING METHOD, RELAY APPARATUS, AND PROGRAM
Publication number
20100250951
Publication date
Sep 30, 2010
NIPPON TELEGRAPH AND TELEPHONE CORPORATIION
Nachi Ueno
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
CLIENT DEVICE, KEY DEVICE, SERVICE PROVIDING APPARATUS, USER AUTHEN...
Publication number
20100088519
Publication date
Apr 8, 2010
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Yukio Tsuruoka
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Application
Packet encryption substituting device, method thereof, and program...
Publication number
20060184789
Publication date
Aug 17, 2006
NIPPON TELEGRAPH AND TELEPHONE CORP.
Kei Karasawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Authentication system based on address, device thereof, and program
Publication number
20060048212
Publication date
Mar 2, 2006
Nippon Telegraph and Telephone Corporation
Yukio Tsuruoka
H04 - ELECTRIC COMMUNICATION TECHNIQUE