| Patents for H01F 27 - Details of transformers or inductances, in general (43,362) |
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| 03/20/1990 | US4910452 High frequency AC magnetic devices with high efficiency |
| 03/15/1990 | DE3830893A1 Coil former for a transformer winding, and a method for production |
| 03/14/1990 | EP0357608A1 High-frequency component. |
| 03/13/1990 | US4907339 Method of construction of a distribution transformer having a coiled magnetic circuit |
| 03/07/1990 | CN2054197U Insulation structure of superhigh voltage tri-coil transformer |
| 03/07/1990 | CN2054196U Plate structure without static electricity at the end of transformer high-voltage winding |
| 03/07/1990 | CN2054195U Oil tank ventilator |
| 03/06/1990 | US4906960 Distribution transformer with coiled magnetic circuit |
| 03/06/1990 | US4906801 Animal guard for power transformers |
| 03/01/1990 | DE3928223A1 Magnetic device for HV pulse generator |
| 02/28/1990 | EP0356294A1 Method for reducing disturbing signals between at least two interconnected elements |
| 02/28/1990 | EP0355558A1 Insulating tape for manufaturing an impregnated insulating jacket for electric conductors |
| 02/28/1990 | EP0355298A2 Air gap in a transformer for a switching power supply |
| 02/27/1990 | US4904975 Coil Former for a high-voltge transformer |
| 02/27/1990 | US4904972 Gas-insulated stationary induction electrical apparatus |
| 02/27/1990 | US4904967 LC composite component |
| 02/27/1990 | US4904926 Magnetic motion electrical generator |
| 02/27/1990 | US4904527 Lamination for use in transformers or the like and method of making the same |
| 02/27/1990 | US4903927 Electrical equipment cluster mount |
| 02/27/1990 | US4903396 Method of making a transformer |
| 02/22/1990 | WO1990001781A1 Inductive coil structure |
| 02/21/1990 | CN2053372U Coil for voltage regulation at wire end |
| 02/21/1990 | CN2053371U Relay transformer with lightning arrester |
| 02/21/1990 | CN2053370U Seamless iron core for three-phase low-consumption transformer |
| 02/21/1990 | CN1039928A Three-phase saturation electric reactor with double-iron core |
| 02/21/1990 | CN1039927A Alternating current ballast |
| 02/20/1990 | US4902998 Inductor assembly with cooled winding turns |
| 02/14/1990 | CN2052935U Low, high, low coil arrangement for superhigh voltage transformer |
| 02/13/1990 | US4901182 Electrical transformer component mounting assembly |
| 02/13/1990 | US4901048 Magnetic core multiple tap or windings devices |
| 02/08/1990 | DE3826282A1 Electrical machine or apparatus having a winding, which has metal-oxide resistors for overvoltage limiting, and a method for its production |
| 02/07/1990 | EP0354121A1 Electromagnetic power coil |
| 02/07/1990 | CN2052568U Variable transformer for load current |
| 02/07/1990 | CN1006745B Miniature inductor and method of manufacture same |
| 02/06/1990 | US4899122 Transformer, choke and the like |
| 02/06/1990 | US4897916 Method for making a tranformer core assembly |
| 01/31/1990 | EP0353137A1 Transformer |
| 01/31/1990 | EP0353029A2 Improvements in laminations |
| 01/31/1990 | EP0352969A2 Plank and frame transformer |
| 01/31/1990 | EP0352924A2 Inductive device |
| 01/31/1990 | CN2052143U On-off power supply transformer for black-and-white tv set |
| 01/30/1990 | US4897758 Protecting an icemaker against over current damage |
| 01/30/1990 | US4897626 Cooling electromagnetic devices |
| 01/30/1990 | US4896856 Electrical equipment cluster mount |
| 01/30/1990 | CA1265217A1 Molded case circuit breaker current transformer with spiral bus |
| 01/25/1990 | WO1990000700A1 Process for depolluting an appliance |
| 01/24/1990 | EP0351583A1 Twin coil |
| 01/24/1990 | EP0269617B1 Transformer |
| 01/24/1990 | CN2051786U Closed type compact fluorescent lamp ballast device without angularity at its sides |
| 01/24/1990 | CN2051770U Three phase distributing transformer capable of alleviating electric shock |
| 01/24/1990 | CN2051769U Transformer capable of alleviating electric shock |
| 01/24/1990 | CN2051768U Energy saving iron core of three phase transformer |
| 01/24/1990 | CN1039143A Wound capacitor device with controlled impedance |
| 01/23/1990 | US4896130 Magnetic system |
| 01/23/1990 | US4894907 Method of making a longitudinally contoured conductor for inductive electrical devices |
| 01/18/1990 | DE3824014A1 Verfahren zum entsorgen eines geraetes A method for disposing of a device |
| 01/17/1990 | CN2051387U High-frequency and high-voltage neon lamp transformer shell |
| 01/16/1990 | US4893400 Method of making a repairable transformer having amorphous metal core |
| 01/11/1990 | DE3822812A1 Two-limbed plug-in core for a transformer |
| 01/11/1990 | DE3822627A1 Inductor, in particular for wideband use |
| 01/10/1990 | EP0169226B1 Improvements in electrical capacitors |
| 01/09/1990 | US4892773 Preparation of amorphous metal core for use in transformer |
| 01/04/1990 | DE3822284A1 High-voltage transformer |
| 01/03/1990 | CN2050655U Three-phase cross connecting wire drawing transformer |
| 01/03/1990 | CN2050654U Internal lead wire sealing type measuring power transformer |
| 01/03/1990 | CN1006340B Orthogonal magnetic field transformer |
| 01/02/1990 | US4891620 Insulating tubeless transformer |
| 12/28/1989 | DE3821284A1 Transformer for a switched-mode power supply, or the line output stage in a television receiver |
| 12/28/1989 | DE3820976A1 SMD inductor or transformer |
| 12/27/1989 | EP0348193A2 Epoxy resin composition |
| 12/27/1989 | EP0348131A2 Electrical apparatus |
| 12/27/1989 | EP0348109A2 Slag detector transducer coil assembly |
| 12/27/1989 | EP0347411A1 Method for decontaminating transformers with pcb |
| 12/26/1989 | US4890086 Transformer assembly |
| 12/26/1989 | US4890085 Terminal fitted bobbin |
| 12/26/1989 | US4890044 High frequency signal suppression component |
| 12/21/1989 | DE3918208A1 High-voltage winding for a high-tension transformer |
| 12/21/1989 | DE3918187A1 Iron core for electromagnetic appliances |
| 12/20/1989 | CN2049818U Ac chopper transformer |
| 12/19/1989 | US4888572 Apparatus for relieving strain on electrical lead |
| 12/19/1989 | US4888571 Coil means |
| 12/19/1989 | US4888568 LC Filter |
| 12/13/1989 | CN2049395U Changeover contact for power transformer screw leading-out terminals |
| 12/13/1989 | CN1006110B Subminiature current transformer |
| 12/07/1989 | DE3816024A1 Carrier strip with connecting lugs for electrical components, and a method for fitting the carrier strip |
| 12/06/1989 | CN2049012U Transformer for steel-smelting furnace |
| 12/05/1989 | US4885559 Electric noise absorber |
| 12/05/1989 | US4885445 High-frequency transformer for microwave oven |
| 11/29/1989 | EP0343886A2 Circuit arrangements |
| 11/29/1989 | CN2048617U Transformer without direct current consumption |
| 11/28/1989 | US4884187 Voltage regulator with ferromagnetic filter |
| 11/28/1989 | US4883918 Transformer mounting pad having a cable opening lined with a safety barrier |
| 11/23/1989 | EP0342468A1 Rail winding |
| 11/22/1989 | CN1037428A 电器绕线部件 Electrical wire components |
| 11/22/1989 | CN1037427A Self-regulated transformer-inductor with air gaps |
| 11/21/1989 | CA1263160A1 Nonuniform laser scribing techniques and resulting products |
| 11/21/1989 | CA1263156A1 Current transformer arrangement for ground fault circuit interrupters |
| 11/21/1989 | CA1263139A1 Electronically controlled coil assembly |
| 11/16/1989 | DE3815073A1 Switched-mode power supply transformer for high switching frequencies |
| 11/15/1989 | CN2047833U Closed oil-water cooling device with two expansion openings |