US PATENT SUBCLASS 252 / 62.56
.~ Iron-oxygen compound containing

Current as of: June, 1999
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252 /   HD   COMPOSITIONS

62.51 R  DF  MAGNETIC {5}
62.56.~ Iron-oxygen compound containing {5}
62.57  DF  .~.~> With scandium, yttrium, gallium, rare earth, or actinide
62.58  DF  .~.~> With boron, aluminum, thallium, or indium
62.59  DF  .~.~> With titanium, zirconium, silicon, hafnium, germanium, or tin
62.6  DF  .~.~> With Group I metal {1}
62.62  DF  .~.~> With Group II metal or lead {2}

DEFINITION

Classification: 252/62.56

(under subclass 62.51) Compositions which contain compounds of iron and oxygen.

(1) Note. Most of the patents in this and indented subclasses are drawn to so called "ferrites," namely complex oxides of iron and other elements. The term ferrite is used in the art both to denote definite compounds of iron with other metals and oxygen, and to generically cover compositions of fused mixed oxides of varying composition classifiable in this class.

(2) Note. In some instances it is difficult to tell whether a fused mixture of oxides (e.g., ferrites) is a compound or a composition. If a claim of this type is restricted to atoms combined in definite, whole number ratios, the product is considered a compound. However, a patent not so limited; e.g., if the ratios of the elements are variable or "impurities" are intentionally present, is considered to be drawn to a composition classifiable in this or indented subclasses.

SEE OR SEARCH THIS CLASS, SUBCLASS:

62.55, for compositions containing both an iron-oxygen compound and a free metal.

SEE OR SEARCH CLASS 423, Chemistry of Inorganic Compounds, for definite compounds of iron with other metals and oxygen.