Naoki Tanaka

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Nagoya, JP

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Patents Grantslast 30 patents

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Apparatus for detecting faults on power transmission lines
- Patent number 5,202,812
- Issue date Apr 13, 1993
- NGK Insulators, Ltd.
- Katsuro Shinoda
- G01 - MEASURING TESTING
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Optical current transformer
- Patent number 5,103,164
- Issue date Apr 7, 1992
- Toshiyuki Kawaguchi
- G01 - MEASURING TESTING
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Helmet with two-way radio communication faculty
- Patent number 4,833,726
- Issue date May 23, 1989
- NGK Insulators, Ltd.
- Katsuro Shinoda
- A42 - HEADWEAR
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Work helmet having transmitter-receiver for light signal
- Patent number 4,648,131
- Issue date Mar 3, 1987
- NGK Insulators, Ltd.
- Toshiyuki Kawaguchi
- A42 - HEADWEAR