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Piezoelectric sensor
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Patent number 5,739,626
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Issue date Apr 14, 1998
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NGK Spark Plug Co., Ltd.
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Takao Kojima
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G01 - MEASURING TESTING
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Oxygen sensor element
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Patent number 5,538,612
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Issue date Jul 23, 1996
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NGK Spark Plug Co., Ltd.
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Takao Kojima
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G01 - MEASURING TESTING
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Oxygen-sensor element
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Patent number 5,443,711
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Issue date Aug 22, 1995
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NGK Spark Plug Co., Ltd.
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Takao Kojima
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G01 - MEASURING TESTING
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Exhaust gas converter device
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Patent number 5,316,738
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Issue date May 31, 1994
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NGK Spark Plug Co., Ltd.
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Takao Kojima
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Pressure sensor
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Patent number 5,214,961
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Issue date Jun 1, 1993
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NGK Spark Plug Co., Ltd.
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Takao Kojima
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G01 - MEASURING TESTING
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Pressure sensor
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Patent number 5,201,228
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Issue date Apr 13, 1993
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NGK Spark Plug Co., Ltd.
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Takao Kojima
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G01 - MEASURING TESTING
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Pressure sensor
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Patent number 5,189,916
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Issue date Mar 2, 1993
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NGK Spark Plug Co., Ltd.
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Katsuyoshi Mizumoto
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G01 - MEASURING TESTING
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Oxygen sensor
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Patent number 4,956,072
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Issue date Sep 11, 1990
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NGK Spark Plug Co., Ltd.
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Takao Kojima
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G01 - MEASURING TESTING