Kenji Hiraiwa

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Saitama, JP

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Patents Grantslast 30 patents

Information Patent Grant
Acoustic conversion device and acoustic conversion device assembly...
- Patent number 8,948,439
- Issue date Feb 3, 2015
- Sony Corporation
- Tsutomu Nagumo
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Acoustic conversion device
- Patent number 8,634,587
- Issue date Jan 21, 2014
- Sony Corporation
- Tsutomu Nagumo
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Acoustic conversion device and acoustic conversion device assembly...
- Patent number 8,630,439
- Issue date Jan 14, 2014
- Sony Corporation
- Tsutomu Nagumo
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Acoustic conversion device
- Patent number 8,588,456
- Issue date Nov 19, 2013
- Sony Corporation
- Tsutomu Nagumo
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

Information Patent Application
ACOUSTIC CONVERSION DEVICE AND ACOUSTIC CONVERSION DEVICE ASSEMBLY...
- Publication number 20110311088
- Publication date Dec 22, 2011
- SONY CORPORATION
- Tsutomu Nagumo
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
ACOUSTIC CONVERSION DEVICE
- Publication number 20110311091
- Publication date Dec 22, 2011
- SONY CORPORATION
- Tsutomu Nagumo
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
ACOUSTIC CONVERSION DEVICE
- Publication number 20110311090
- Publication date Dec 22, 2011
- SONY CORPORATION
- Tsutomu Nagumo
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
ACOUSTIC CONVERSION DEVICE AND ACOUSTIC CONVERSION DEVICE ASSEMBLY...
- Publication number 20110311089
- Publication date Dec 22, 2011
- SONY CORPORATION
- Tsutomu Nagumo
- H04 - ELECTRIC COMMUNICATION TECHNIQUE