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Hiroki Yamada
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Tokyo, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Communication device, surveillance server, and log collection method
Patent number
12,021,681
Issue date
Jun 25, 2024
Hitachi Industrial Equipment Systems Co., Ltd.
Hiroki Yamada
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Computer system, method for estimating radio wave propagation chara...
Patent number
11,133,880
Issue date
Sep 28, 2021
Hitachi, Ltd.
Hiroki Yamada
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Clock recovery circuit with memory storage level comparison with hi...
Patent number
5,274,681
Issue date
Dec 28, 1993
NEC Corporation
Hiroki Yamada
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Patents Applications
last 30 patents
Information
Patent Application
Communication Device, Surveillance Server, and Log Collection Method
Publication number
20230047615
Publication date
Feb 16, 2023
HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD.
Hiroki YAMADA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
COMPUTER SYSTEM, METHOD FOR ESTIMATING RADIO WAVE PROPAGATION CHARA...
Publication number
20200235835
Publication date
Jul 23, 2020
Hitachi, Ltd
Hiroki YAMADA
H04 - ELECTRIC COMMUNICATION TECHNIQUE