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Toshihiko Uchiyama
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Hitachi, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Method of locating fault of communication system
Patent number
5,706,422
Issue date
Jan 6, 1998
Hitachi Ltd.
Hisayuki Maruyama
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Data transmission method and system thereof
Patent number
5,497,374
Issue date
Mar 5, 1996
Hitachi, Ltd.
Hisayuki Maruyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Transmission method and system thereof
Patent number
5,426,638
Issue date
Jun 20, 1995
Hitachi, Ltd.
Hisayuki Maruyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Method and apparatus for detecting a fault in a ring network data t...
Patent number
4,855,993
Issue date
Aug 8, 1989
501 Hitachi, Ltd.
Takuji Hamada
H04 - ELECTRIC COMMUNICATION TECHNIQUE