other gas; decomposing other gas; measuring pressureUS6036841 *May 12, 1997Mar 14, 2000Ngk Insulators, Ltd.Method for measuring nitrogen oxideUS6045673 *Sep 11, 1997Apr 4, 2000Ngk Insulators, Ltd.Gas sensor for measuring oxides such as nitrogen oxides, sulfur dioxide, water and inflammable gases such as carbon monoxide or hydrocarbon gases contained in atmospheric air and exhaust gas discharge fro