Hiroyoshi Matsumura

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Tokyo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Semiconductor laser module
- Patent number 7,387,452
- Issue date Jun 17, 2008
- Tecdia Co., Ltd.
- Etsuo Koyama
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Optical switch and optical add/drop multiplexer
- Patent number 7,343,064
- Issue date Mar 11, 2008
- Tecdia Co., Ltd.
- Etsuo Koyama
- G02 - OPTICS

Patents Applicationslast 30 patents

Information Patent Application
Semiconductor laser module
- Publication number 20080089643
- Publication date Apr 17, 2008
- Tecdia Co., Ltd.
- Etsuo Koyama
- G02 - OPTICS
Information Patent Application
Optical switch and optical add/drop multiplexer
- Publication number 20070211987
- Publication date Sep 13, 2007
- Tecdia Co., Ltd.
- Etsuo Koyama
- G02 - OPTICS
Information Patent Application
Tunable optical filter and external-resonator-type semiconductor la...
- Publication number 20070177637
- Publication date Aug 2, 2007
- Tecdia Co., Ltd.
- Etsuo Koyama
- G02 - OPTICS