Black manganese/iron oxide pigment a process for its production and its use
Patent 5164005 Issued on November 17, 1992. Estimated Expiration Date: 
March 18, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 18, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesPreparation of finely divided isotropic ferrite powders having the spinel structure Patent #: 4680130 InventorsApplicationNo. 853886 filed on 03/18/1992US Classes:106/459, With other metal compound106/455Antimony containing (Sb)ExaminersPrimary: Dixon, William R. Jr.Assistant: Einsmann, Margaret Attorney, Agent or FirmInternational ClassC09C 001/22Foreign Application Priority Data1990-02-03 DEAbstractA black manganese/iron oxide pigment having a spinel structure and having the composition Mnx Fe3-x O4 wherein x has a value from 0.1 to 0.9, is prepared by the steps:a) oxidizing iron(II) salts or mixtures of iron(II) salts and manganese(II) salts, in solution or after reaction with alkaline precipitants, with manganese dioxide or other compounds containing manganese in high valency,b) additionally oxidizing the salts of (a) to establish an Fe(III) content therein with another oxidizing agent, andc) filtering, washing, drying and grinding the pigment;and the pigment is useful for pigmenting building materials to a black color. | |
