92 results about "Ferrous" patented technology

In chemistry, the adjective ferrous indicates a compound that contains iron in the +2 oxidation state, possibly as the divalent cation Fe²⁺. It is opposed to "ferric", which indicates presence of iron in a +3 oxidation state, such as the trivalent cation Fe³⁺. This usage has been largely replaced by the IUPAC nomenclature, which calls for the oxidation state being indicated by Roman numerals in parentheses, such as iron(II) oxide for ferrous oxide (FeO), iron(III) oxide for ferric oxide (Fe₂O₃), and iron(II,III) oxide for the oxide Fe3O4 that contains both forms of iron.