Nippan Kenkyujo Co., Ltd.

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Kanagawa-ken, JP

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Patents Grantslast 30 patents

Information Patent Grant
Speaker voice coil bobbin and method of manufacturing same
- Patent number 6,909,788
- Issue date Jun 21, 2005
- Pioneer Corporation
- Toshihiro Ishigaki
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Speaker diaphragm and method of manufacturing same
- Patent number 6,740,202
- Issue date May 25, 2004
- Pioneer Corporation
- Toshihiro Ishigaki
- H04 - ELECTRIC COMMUNICATION TECHNIQUE