| Patents for H01F 29 - Variable transformers or inductances not covered by group (3,889) |
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| 09/07/1994 | CN2176594Y Arc blowout device for loading switch contacts |
| 09/07/1994 | CN2176591Y Position changing selector |
| 07/21/1994 | DE4300708C1 Contact device for transformer tapped winding voltage selector |
| 07/21/1994 | DE4300707C1 Voltage setting circuit for tapped transformer |
| 07/21/1994 | DE4236975A1 Stepped winding for transformers and choke coils |
| 07/12/1994 | US5329268 Transformer variable power |
| 06/23/1994 | DE4341158A1 Tapped transformer load selector circuit arrangement |
| 06/22/1994 | CN2169906Y Automatic voltage regulator |
| 06/22/1994 | CN2169905Y Composite film aluminium band winding transformer |
| 06/08/1994 | EP0600612A1 Air core reactor with conductor winding rigidly anchored to structural sleeve |
| 06/08/1994 | CN1087745A Air core reactor with conductor winding rigidly anchored to structural sleeve |
| 05/26/1994 | WO1994011891A1 Controllable inductor |
| 05/25/1994 | CN2166508Y 10/6KV autotransformer |
| 05/24/1994 | US5315078 Polarity switch for step-transformer selector |
| 05/18/1994 | EP0597497A1 Electronically tuned matching networks using adjustable inductance elements and resonant tank circuits |
| 05/18/1994 | CN2165512Y Contact voltage-regulating transformer |
| 05/11/1994 | CN2164590Y Transformer made of oxide coated aluminium belt winded |
| 05/10/1994 | US5311163 Electrically operated magnetic switch designed to display reduced leakage inductance |
| 05/06/1994 | CA2102467A1 Air core reactor with conductor winding rigidly anchored to structural sleeve |
| 03/17/1994 | DE4330734A1 Rolling contact device for electric stepping switch - has holding shafts for two pairs of roller contacts and bridging latches supported by parallel guide shafts |
| 02/23/1994 | CN2157585Y Moving contact mechanism for compound vacuum loaded tap switch |
| 02/16/1994 | CN2156578Y Voltage adjusting device |
| 02/16/1994 | CN1082244A Adjustable ballast for more lamps with safe isolation between them |
| 02/02/1994 | CN2155060Y Detatching-free one-phase transformer when regulating voltage |
| 02/01/1994 | US5283728 In a voltage control system for an alternating current power supply |
| 01/20/1994 | WO1994001878A1 On-load tap changer |
| 01/20/1994 | WO1994001814A1 Enhanced transformer |
| 01/20/1994 | DE4318995A1 Ballast for LV halogen or Mercury@ discharge lamp - has energising transformer with core without air gap and two coil groups |
| 01/05/1994 | CN2152285Y Loaded tapping switch |
| 01/05/1994 | CN2152284Y Auto voltage regulator with isolated layer |
| 12/23/1993 | DE4320509A1 Current supply circuitry esp. for motor vehicle - uses three=phase, pref. voltage-regulated, generator with additional transformer providing independent supply for, e.g. controlled warm=up of exhaust catalytic converter |
| 12/22/1993 | CN2150618Y Unblocking transformer |
| 12/09/1993 | WO1993024943A1 Arrangement for generating the ignition voltage for thyristors |
| 12/01/1993 | CN1079070A Automatically regulating capacity transformer |
| 11/30/1993 | US5266759 Actuator for a step-transformer load switch |
| 11/25/1993 | WO1993023861A1 Step switch |
| 11/24/1993 | CN2147629Y Loading voltage regulator |
| 09/29/1993 | CN2142996Y Energy-saving electric transformer with low noice |
| 09/22/1993 | CN2142599Y Plate type distribution switch without magnetic excitation |
| 09/22/1993 | CN1076545A High stability multi-nominal value standard inducer |
| 09/08/1993 | CN1076053A 变压器 Transformer |
| 08/04/1993 | CN1075028A Transformer tap switch with abrasion-free contact |
| 06/23/1993 | CN2137019Y Transformer for submersible oil and electric pump on sea platform |
| 06/16/1993 | EP0546283A2 Polarity switch for tap selector |
| 06/09/1993 | CN2135822Y Single-phase adjustable transformer |
| 06/09/1993 | CN1073037A Non-linear inductor with magnetic field reduction |
| 06/02/1993 | CN2135188Y No-excitation disk neutral-point voltage-regulating tap switch |
| 05/26/1993 | EP0543120A2 Contact assembly. |
| 05/26/1993 | CN2134701Y Contact chip wholly floating self-retaining transformer shunt switch |
| 05/20/1993 | CA2083096A1 Contact assembly for selector of step transformer |
| 05/19/1993 | DE4137776A1 Multilayer HF power transformer for resonant inverter - has soft magnetic core of which one limb passes through holes in multilayer boards carrying prim. and sec. winding tracks |
| 05/19/1993 | CN2133911Y Series voltage regulator |
| 05/18/1993 | CA1317998C Electromagnetic contactor with lightweight wide range current transducer |
| 05/12/1993 | EP0375687B1 Thyristor on-load change-over switch |
| 05/05/1993 | CN2132257Y Post contacting device for voltage regulator |
| 05/05/1993 | CN2132256Y Loading branch connection switch |
| 05/05/1993 | CN2132255Y Dividual connecting switch for transformer |
| 04/28/1993 | CN2131181Y Core rotation type variable contact voltage regulator |
| 04/21/1993 | EP0538172A1 Voltage supply transformer |
| 04/14/1993 | CN2129967Y Rapid switching accurate position contact voltage regulator |
| 04/06/1993 | CA1315845C Non-saturating magnetic amplifier controller |
| 04/01/1993 | DE4231353A1 Stage switch changing coils of power electrical transformer - couples adjacent stages to tapping contacts with movable contact engaging common contact and having current limiting resistor. |
| 03/17/1993 | EP0532360A1 Transformer with controlled interwinding coupling and controlled leakage inductances and circuit using such transformer |
| 03/03/1993 | CA2074892A1 Non-linear inductor with magnetic field reduction |
| 02/17/1993 | CN2127203Y Non-exciting drop switch |
| 01/23/1993 | CA2073283A1 Method of and article for containing chips from an amorphous metal core |
| 01/20/1993 | EP0523517A1 Leakage transformer, especially for gas discharge lamps |
| 01/05/1993 | US5177762 Saturable reactor |
| 12/29/1992 | US5175526 Inductance device, particularly for short waves |
| 12/23/1992 | CN2125872U Monophase type adjustable transformer |
| 12/16/1992 | CN2125190U 35 kv adjustable current-limiting reactor |
| 12/09/1992 | CN2124503U Operating mechanism of no-excitation tap switch |
| 12/09/1992 | CN2124502U Operating mode energy-saving type transformer |
| 12/02/1992 | EP0516377A2 An improved tapped-inductor boost convertor for operating a gas discharge lamp |
| 11/29/1992 | CA2068153A1 Tapped-inductor boost convertor for operating a gas discharge lamp |
| 11/24/1992 | US5165295 End stop for stepper for step-type transformer |
| 11/18/1992 | CN2122424U Self-coupling contact voltage regulator operated manufally and electrically |
| 11/11/1992 | CN2121741U 可调电抗器 Adjustable Reactor |
| 11/10/1992 | US5163173 Variable impedance transformer with equalizing winding |
| 11/04/1992 | CN2121067U Voltage regulator with two-side regulating for ring coil |
| 10/28/1992 | EP0510474A1 Adjusting device |
| 10/28/1992 | CN2120378U Portable adjustable current generator |
| 10/21/1992 | EP0284615B1 Magnetic material biasing method and apparatus |
| 10/06/1992 | US5153548 Variable inductor |
| 09/23/1992 | CN2116955U Miniature circular electric current generator |
| 09/22/1992 | CA1307823C Electromagnetic contactor with lightweight wide range current transducer with sintered powdered metal core |
| 09/01/1992 | US5144204 Tapped-inductor boost convertor for operating a gas discharge lamp |
| 08/26/1992 | CN2114211U Non-excitation disk-type middle voltage-regulating tap switch |
| 08/26/1992 | CN2114210U Transformer tap switch |
| 08/26/1992 | CN1018035B Gyromagnetic regulating transformer |
| 08/12/1992 | CN1063576A Electric-shock-proof piezoelectric unit for triphase power supply |
| 07/22/1992 | CN2110912U Transformer |
| 07/08/1992 | CN2109622U On-load automatic capacity adjusting transformer |
| 07/08/1992 | CN2109621U Anti-shock voltage adjusting piezoelectric device |
| 07/08/1992 | CA2056863A1 Integrated over-current and over-voltage protection for distribution transformer secondary winding |
| 07/07/1992 | US5128605 Monitoring system for step-type switching transformer |
| 06/24/1992 | CN2108351U Transformer |
| 06/10/1992 | CN2107052U Non-excitation disk-type neutral-point voltage-regulating tap switch |
| 06/10/1992 | CN2107051U Non-excitation disk-type middle voltage-regulating tap switch |
| 06/03/1992 | CN1061677A Inductance device, particularly for short waves |