Magnetic amplifier
Patent 4675615 Issued on June 23, 1987. Estimated Expiration Date: 
December 30, 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.
December 30, 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 ReferencesVoltage regulator using saturable transformer Patent #: 4339792 InventorApplicationNo. 06/814263 filed on 12/30/1985US Classes:330/8, WITH SATURABLE REACTOR-TYPE AMPLIFYING DEVICE324/253, Saturable core magnetometers336/110, WITH PERMANENT MAGNET336/184, Coils having different axis or on different core legs336/20, WITH DEFORMABLE OR DISTORTABLE COIL AND/OR CORE336/215, Three or more73/862.69By measuring magnetic propertiesExaminersPrimary: Mullins, James B.Attorney, Agent or FirmInternational ClassesG01R 33/04 (20060101)H03F 9/00 (20060101) AbstractA magnetic amplifier employing a single four-legged ferrite core having orthogonally disposed through holes in the core. Biasing is provided of the magnetic core so as to provide operation in the non-linear parts of the core's hysteresis cycle. A first coil on the ferromagnetic core has an AC excitation signal applied thereto and a second coil on the core is wound orthogonally to the first coil and is adapted to have an output signal derived therefrom. A control or input current in a third coil is used to unbalance the magnetic bridge formed by the four legs, so as to produce a mutual inductance different from zero between the first and second coil. The biasing may be provided by a fourth coil or by permanent magnet means.Other References
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