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Koji HIRAYAMA
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Yokohama, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Communication system, a communication method and communication term...
Patent number
7,020,084
Issue date
Mar 28, 2006
Hitachi, Ltd.
Koji Tanaka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Wireless base station and packet transfer apparatus for dynamically...
Patent number
7,003,302
Issue date
Feb 21, 2006
Hitachi, Ltd.
Kiyohiko Yoshida
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Switching system and switching control method
Patent number
6,879,592
Issue date
Apr 12, 2005
Hitachi, Ltd.
Koji Hirayama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Mobile communication system
Patent number
6,826,167
Issue date
Nov 30, 2004
Hitachi, Ltd.
Tatsuaki Osafune
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Mobil communication system for providing IP packet communications a...
Patent number
6,731,621
Issue date
May 4, 2004
Hitachi, Ltd.
Mika Mizutani
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Patents Applications
last 30 patents
Information
Patent Application
DIGITAL SIGNAGE SYSTEM AND IMAGE DISPLAY CONTROL METHOD
Publication number
20110105159
Publication date
May 5, 2011
Hitachi, Ltd.
KOJI HIRAYAMA
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Application
COMMUNICATION CHANNEL SWITCH
Publication number
20100238943
Publication date
Sep 23, 2010
Hitachi, Ltd.
Koji HIRAYAMA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Mobile communication system
Publication number
20020072367
Publication date
Jun 13, 2002
Tatsuaki Osafune
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Wireless base station and packet transfer apparatus for dynamically...
Publication number
20020068588
Publication date
Jun 6, 2002
Kiyohiko Yoshida
H04 - ELECTRIC COMMUNICATION TECHNIQUE