Parkhurst, Wendel & Rossi
Oxygen sensor
 An oxygen sensor has a planar sensor element which generates electromotive forces or varies an electric resistance between electrodes formed on opposite surfaces of the planar sensor element depending upon concentrations of oxygen in exhaust gases, a metallic housing member for housing the sensor element therein, a ceramic powder placed around the planar sensor element in the metallic housing member and adapted to fix the planar sensor element and form a gas-sealed section and ceramic supporters for compacting the ceramic powder under a given pressure therebetween. The portion of at least one of the ceramic supporters which contacts the ceramic powder is provided with a projection. 
NGK Insulators, Ltd.
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inventional inventional inventional
Masanori Nobuhide
Katsu Kato