Wenderoth, Lind & Ponack
Process for reducing nitrogen oxides
 The reduction of nitrogen oxides is effected by passing stack offgases containing nitrogen oxides over a heavy metal sulfide catalyst in an atmosphere where ammonia is present. 
Kurashiki Boseki Kabushiki Kaisha
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Tateo Sumio Masumi Shigeaki
Ito Tani Saito Kasaoka