US2695215A of chromium oxide Patents
US2695215A US162397A US16239750A US2695215A US 2695215 A US2695215 A US 2695215A US 162397 A US162397 A US 162397A US 16239750 A US16239750 A US 16239750A US 2695215 A US2695215 A US 2695215A Authority US United States Prior art keywords sodium chromium chromium oxide chromate thiosulfate Prior art date 1950 05 16 Legal status The legal status is an assumption