Koichi Tokunaga

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Tokyo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Method and system for wavelength division multiplexed optical signa...
- Patent number 7,627,256
- Issue date Dec 1, 2009
- NEC Corporation
- Koichi Tokunaga
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Alarm control system and method
- Patent number 7,068,931
- Issue date Jun 27, 2006
- NEC Corporation
- Koichi Tokunaga
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

Information Patent Application
Method and system for wavelength division multiplexed optical signa...
- Publication number 20050286899
- Publication date Dec 29, 2005
- NEC Corporation
- Koichi Tokunaga
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Alarm control system and method
- Publication number 20020159113
- Publication date Oct 31, 2002
- NEC Corporation
- Koichi Tokunaga
- H04 - ELECTRIC COMMUNICATION TECHNIQUE