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Hiroki Koyama
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Yokohama, JP
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Patents Grants
last 30 patents
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Patent Grant
Data multiplexing system having at least one low-speed interface ci...
Patent number
5,757,806
Issue date
May 26, 1998
Hitachi, Ltd.
Hiroki Koyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Data multiplexing system having at least one low-speed interface ci...
Patent number
5,452,307
Issue date
Sep 19, 1995
Hitachi, Ltd.
Hiroki Koyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Patents Applications
last 30 patents
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Patent Application
PASSIVE OPTICAL NETWORK SYSTEM, STATION SIDE APPARATUS AND POWER CO...
Publication number
20120128349
Publication date
May 24, 2012
Hitachi, Ltd.
Daiji MITSUNAGA
H04 - ELECTRIC COMMUNICATION TECHNIQUE