Hirohisa Sakuma

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Minato-ku, JP

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Patents Grantslast 30 patents

Information Patent Grant
Acoustic communication device and acoustic signal communication method
- Patent number 7,027,357
- Issue date Apr 11, 2006
- Tokyo Gas Co., Ltd.
- Hirohisa Sakuma
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

Information Patent Application
Acoustic communication device and acoustic signal communication method
- Publication number 20030117896
- Publication date Jun 26, 2003
- TOKYO GAS Co., Ltd.
- Hirohisa Sakuma
- H04 - ELECTRIC COMMUNICATION TECHNIQUE