Electromagnetic devices
Patent 4090097 Issued on May 16, 1978. Estimated Expiration Date: 
May 16, 1995. 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.
May 16, 1995. 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 3353040 Electromagnetic devices Patent #: 4003013 InventorAssigneeApplicationNo. 751722 filed on 12/17/1976US Classes:310/27, Fixed and movable wound elements335/220, With magneto-mechanical motive device (e.g., electromagnet with armature)335/266Plural coils or magnets control armature movementExaminersPrimary: Duggan, Donovan F.Attorney, Agent or FirmInternational ClassH02K 033/00Foreign Application Priority Data1976-01-22 UKAbstractAn electromagnetic device comprises an annular member and a core member the latter having formed in its slots and the annular member having projections located in said slots. The projections and the adjacent wall of the slot define attraction faces which when a winding located in the slot is energized, are attracted towards each other thereby to produce relative movement between the members. The other faces of the projection are provided in accordance with the invention, with a coating of an electrically conductive material so that when the windings are energized eddy currents flow in the conductive material which act to assist the relative movement of the members. | |
