| Patents for H01F 27 - Details of transformers or inductances, in general (43,362) |
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| 07/11/1989 | US4847575 Noise filter having multiple layers rolled into an elliptical shape |
| 07/11/1989 | US4847554 Compensating for DC current |
| 07/06/1989 | DE3744122A1 Reversed transformer |
| 07/05/1989 | CN1033712A Miniature high frequency power transformer |
| 07/04/1989 | US4845454 Inductance element with core of magnetic thin films |
| 07/04/1989 | CA1256974A1 Snap-on transformer terminal cover |
| 06/29/1989 | DE3743222A1 Cooled inductor coil for converter installations |
| 06/29/1989 | DE3743216A1 Hochfrequenzschwingkreis High-frequency resonant circuit |
| 06/28/1989 | EP0321643A2 Device constituting an electrically conductive connection for transformers or distributing installations |
| 06/28/1989 | EP0321469A1 Reclassification of electrical apparatus contaminated with pcb. |
| 06/27/1989 | US4843362 Ignition coil for internal combustion engine |
| 06/27/1989 | US4843187 Gasket assembly and electrical power transformer including the same |
| 06/27/1989 | US4842352 Chip-like inductance element |
| 06/27/1989 | EP0313574A4 Potted electrical/mechanical devices, and dual cure potting method. |
| 06/20/1989 | US4841270 Heat-distributing winding |
| 06/20/1989 | US4841201 Display device including flyback transformer constructed to control leakage currents |
| 06/14/1989 | EP0320414A1 Voltage regulator with a ferro-resonance filter with a cooling device |
| 06/14/1989 | EP0320187A1 Transformer tank |
| 06/14/1989 | EP0320018A1 Reactor coil |
| 06/14/1989 | CN2039451U Single-phase constant-current transformer fed with a balanced three phase source |
| 06/14/1989 | CN1033426A Vibration insulation device for inductive electrical equipment and attaching structure of wheel apparatus |
| 06/13/1989 | US4839622 Transformer core clamping structure |
| 06/13/1989 | CA1255775A1 Modular electronic temperature controller |
| 06/08/1989 | DE3738907A1 Instrument transformer (measurement transformer, measurement transducer) and associated electric-shock protection cap |
| 06/07/1989 | EP0318955A1 Miniature high frequency power transformer |
| 06/06/1989 | US4837659 Transformer/inductor with integrated capacitor using soft ferrites |
| 06/06/1989 | US4837543 Transformer core and coil support assembly |
| 06/06/1989 | US4836769 Water-cooled winding for electromagnetic stirrer |
| 06/06/1989 | US4836399 Improved liquid tight transformer casing |
| 06/06/1989 | US4835841 Method of making a coil assembly |
| 06/01/1989 | WO1989005035A1 Wound capacitor device with controlled impedance |
| 05/31/1989 | EP0318322A1 Transformer component mounting assembly |
| 05/31/1989 | EP0318177A1 Moulded product |
| 05/30/1989 | US4834257 Reinforced wall structure for a transformer tank |
| 05/30/1989 | CA1254964A1 Insulation of electrical terminations |
| 05/24/1989 | EP0317043A1 Mounting an electromagnetic coil on an armature |
| 05/24/1989 | DE3738604A1 Apparatus for sampling electrical signals |
| 05/24/1989 | DE3738410A1 Coil for a transformer or repeating coil |
| 05/24/1989 | CN2038274U Three-phase balance single-phase transformer |
| 05/23/1989 | US4833437 Magnetic core inductor |
| 05/23/1989 | US4833436 Formed metal core blocking |
| 05/23/1989 | US4833432 Saturable reactor for use in self-convergence system fo deflection yoke |
| 05/18/1989 | DE3737887A1 Device for mounting a transformer |
| 05/16/1989 | US4831352 Rectifier transformer |
| 05/10/1989 | EP0315527A1 Transformer with a magnetic ferrite circuit resistant to thermal shocks |
| 05/10/1989 | CN1032881A Magnetic core for miniature transformer |
| 05/09/1989 | US4829417 High-power transformer |
| 05/09/1989 | US4829207 Enhanced electromagnetic radiation transmission device |
| 05/09/1989 | US4828961 Imaging process for forming ceramic electronic circuits |
| 05/09/1989 | US4828703 Draining, filling with interim dielectric, operating, draining |
| 05/03/1989 | EP0314107A1 Power Transformer for HI-FI Equipment |
| 05/03/1989 | EP0313574A1 Potted electrical/mechanical devices, and dual cure potting method. |
| 05/02/1989 | US4827237 Transformer core assembly |
| 05/02/1989 | CA1253589A1 Magnetic core and methods of consolidating same |
| 05/02/1989 | CA1253588A1 Coil and method for its manufacture |
| 05/02/1989 | CA1253587A1 Segmented toroidal air-core transformer |
| 04/27/1989 | DE3741391C1 Winding element for a winding on an enclosed core |
| 04/26/1989 | EP0312973A1 Winding element for transformers and similar devices |
| 04/26/1989 | CN2036699U Line output transformer |
| 04/26/1989 | CN1032603A Transformer insulation barrier and method for manufacture |
| 04/25/1989 | US4825185 Electric noise absorber |
| 04/24/1989 | EP0203083A4 Folded rf marker for electronic article surveillance systems. |
| 04/20/1989 | DE3733572A1 Dielectric liquids |
| 04/20/1989 | DE3732965A1 Inductor or transformer, especially for use as a ballast for gas-discharge lamps |
| 04/19/1989 | CN1032468A Butt-lap-step core joint |
| 04/19/1989 | CN1032467A Method for elimination of containing micro-moisture in power transformer oil |
| 04/18/1989 | US4823103 Electrical component having a lead wire secured in a through hole |
| 04/13/1989 | DE3732670A1 Arrangement of a transformer and of a mast in an overhead-line system for electricity transmission |
| 04/12/1989 | EP0310813A1 Butt-lap-step core joint |
| 04/12/1989 | CN2035911U Silicon sheet drawing plate |
| 04/11/1989 | US4821152 Method and device for mounting electric components on a circuit board |
| 04/11/1989 | US4821138 Monitoring device for overhead power transmission system |
| 04/11/1989 | CA1252445A1 Adjustable light base and transformer housing |
| 04/06/1989 | WO1989002795A1 Transformer insulation barrier and method for manufacture |
| 04/06/1989 | DE3732382A1 Transformer |
| 04/05/1989 | EP0309837A1 Transformer, especially for a switching power supply |
| 04/05/1989 | EP0309690A1 Transformer or inductance with yoke-side clamping supports to be clamped together by tie-rods, and method of manufacturing such transformer or inductance |
| 04/05/1989 | CN2035527U Gas insulation dry testing transformer |
| 04/04/1989 | US4818957 Ferrite toroid isolator |
| 04/04/1989 | US4817706 Liquid cooling type uniform magnetic field coil |
| 03/30/1989 | DE3730303A1 Tunable helical circuit |
| 03/30/1989 | DE3730302A1 Tunable helical band-pass filter for the radio-frequency region |
| 03/28/1989 | US4817189 Directional high frequency broadband transformer made by printed circuit technique |
| 03/28/1989 | US4816784 Balanced planar transformers |
| 03/28/1989 | CA1251823A1 Electromagnet system with protection against overheating |
| 03/23/1989 | DE3729672A1 Holder for annular cores |
| 03/22/1989 | EP0307716A1 Method for removing traces of water from power transformer oil |
| 03/21/1989 | US4814736 Wound transformer core |
| 03/21/1989 | US4814735 Magnetic core multiple tap or windings devices |
| 03/21/1989 | US4814733 High-voltage transformer |
| 03/21/1989 | US4814021 Apparatus and method for reclassifying electrical apparatus contaminated with PCB |
| 03/15/1989 | EP0307036A1 Transformer |
| 03/15/1989 | CN2034324U 方向变压器 Direction of the transformer |
| 03/14/1989 | US4812798 Electric transformer for microwave ovens |
| 03/14/1989 | US4811477 Method of winding toroid transformers |
| 03/09/1989 | DE3729048A1 Physical protection for a transformer of high rated power |
| 03/08/1989 | CN2033939U Full sealing cold expansion device |
| 03/07/1989 | US4810991 Encapsulated integral fuse block transformer |
| 03/07/1989 | US4810988 Slag detector transducer coil assembly |
| 03/07/1989 | US4810899 High-voltage connection device, especially for a high-voltage transformer, without lead-out cables and with detachable potentiometer set |