Production method for permanent magnet and press device
Patent 7371290 Issued on May 13, 2008. Estimated Expiration Date: 
December 2, 2022. 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.
December 2, 2022. 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 ReferencesSurface multipolar rare earth-iron-boron rotor magnet and method of making Rare earth-iron-boron magnet powder and process of producing same Method and apparatus for producing compact of rare earth alloy powder and rare earth magnet Method and apparatus for feeding magnetic powder and method for manufacturing magnet Patent #: 6432354 InventorsAssigneeApplicationNo. 10474546 filed on 12/02/2002US Classes:148/103, Treatment in a magnetic field148/101, Permanent magnet148/104, Dust cores419/66Consolidation of powdersExaminersPrimary: Sheehan, John P.Attorney, Agent or FirmForeign Patent References
International ClassH01F 1/08AbstractTo avoid various problems caused by remnant magnetization and produce an anisotropic bonded magnet at a reduced cost, a method for producing an anisotropic bonded magnet by feeding a magnetic powder (such as an HDDR powder) into the cavity of a press machine and compacting it is provided. A weak magnetic field is created as a static magnetic field in a space including the cavity by using a magnetic member that is steadily magnetized. The magnetic powder being transported into the cavity is aligned parallel to the direction of the weak magnetic field. Next, the magnetic powder is compressed in the cavity, thereby obtaining a compact.Other References
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