Ryouji Yamaoka

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Chiba, JP

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Patents Grantslast 30 patents

Information Patent Grant
Cognitive wireless communication system
- Patent number 8,219,131
- Issue date Jul 10, 2012
- Hitachi, Ltd.
- Ryouji Yamaoka
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Wireless communication system for communicating via wireless LAN
- Patent number 8,094,636
- Issue date Jan 10, 2012
- Hitachi, Ltd.
- Ryouji Yamaoka
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Communication system for selecting communication method
- Patent number 8,073,462
- Issue date Dec 6, 2011
- Hitachi, Ltd.
- Junji Yamamoto
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

Information Patent Application
Communication system for selecting communication method
- Publication number 20090061893
- Publication date Mar 5, 2009
- Hitachi, Ltd.
- Junji Yamamoto
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Wireless communication system for communicating via wireless LAN
- Publication number 20090059879
- Publication date Mar 5, 2009
- Hitachi, Ltd.
- Ryouji Yamaoka
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Cognitive wireless communication system
- Publication number 20080182605
- Publication date Jul 31, 2008
- Ryouji Yamaoka
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Distributed authentication system and communication control apparatus
- Publication number 20070192484
- Publication date Aug 16, 2007
- Hitachi, Ltd.
- Ryouji Yamaoka
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Communication node, communication network and method for updating d...
- Publication number 20060198382
- Publication date Sep 7, 2006
- Hitachi, Ltd.
- Kazuhiko Sagara
- H04 - ELECTRIC COMMUNICATION TECHNIQUE