Preparation of finely divided isotropic ferrite powders having the spinel structure
Patent 4680130 Issued on July 14, 1987. Estimated Expiration Date: 
September 26, 2005. 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.
September 26, 2005. 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 References 3822210 Pigments stable at high temperatures Yellow pigments stable at high temperatures Hard ferrite powder and process for the preparation thereof Preparation of finely divided ferrite powders Production of microcrystalline ferrimagnetic spinels Production of fine ferrimagnetic spinels Patent #: 4486401 InventorAssigneeApplicationNo. 06/780458 filed on 09/26/1985US Classes:252/62.6, With Group I metal106/459, With other metal compound252/62.62, With Group II metal or lead252/62.64, Magnesium423/594.1, Iron (Fe) containing423/594.3Nickel (Ni) containingExaminersPrimary: Lechert, Stephen J. Jr.Attorney, Agent or FirmInternational ClassesC01G 53/00 (20060101)C01G 49/00 (20060101) C01G 51/00 (20060101) C09C 1/22 (20060101) C09C 1/24 (20060101) H01F 1/44 (20060101) H01F 1/032 (20060101) C04B 35/26 (20060101) C08K 3/00 (20060101) C08K 3/24 (20060101) G11B 5/706 (20060101) H01F 1/117 (20060101) AbstractA process for the preparation of ferrite powders which have a particle fineness which can be set to a defined value, of the general compositionandwhere M is Mg, Mn, Co, Ni, Cu and/or Zn and x is from 0 to 1, and have an essentially isotropic particle shape. |
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