| Patents for H01F 29 - Variable transformers or inductances not covered by group (3,889) |
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| 06/02/1992 | US5118998 Multi-tap primary coil for gas discharge lamps |
| 05/27/1992 | EP0487388A1 Inductor, particularly for short waves |
| 05/27/1992 | CN2105748U Autoinductive coupling transformer for electric motor voltage reducing starter |
| 05/24/1992 | CA2055658A1 Inductance device, particularly for short waves |
| 05/06/1992 | CN2103855U Three-phase voltage-dividing type regulating transformer |
| 04/29/1992 | CN2103194U Check contact type voltage regulator |
| 04/22/1992 | EP0481755A2 Electromagnetic windy structures, and methods for forming electromagnetic winding structures |
| 04/21/1992 | US5107200 Load switch for a step transformer |
| 04/07/1992 | US5101675 Force-storing actuator for rotor of step transformer |
| 03/25/1992 | CN2100018U Double-shuttle reverse oblique-wound self-coupling voltage regulator |
| 03/25/1992 | CN2100017U Constant power transformer with voltage regulation under load |
| 03/25/1992 | CN1016021B Seated contact arrangement in insulating material wall for step selector of step transformer |
| 03/11/1992 | CN2098724U Transformer with double voltage regulatings |
| 02/25/1992 | CA1296399C High-voltage winding for core form power transformers |
| 02/19/1992 | CN2096807U Excitless plate shape shunting switch |
| 02/18/1992 | US5089930 Temperature compensated linear variable transformer |
| 02/12/1992 | CN2096121U Two phase constant power multi-stage loaded voltage regulating switch |
| 02/12/1992 | CN2096120U Voltage regulator with load converter |
| 01/22/1992 | CN2094104U Three-phase double voltage-regulating transformer |
| 01/22/1992 | CN2094103U Head construction of no-excitation tapping switch |
| 01/16/1992 | DE4021860A1 Reduction of transformer noise - is obtained by second winding with compensating current generation |
| 01/02/1992 | DE4020609A1 Transformer for stunning pig - provides rapid peaking of secondary voltage and current, operating in saturation region |
| 01/01/1992 | CN2092137U Tapping switch without excitation |
| 01/01/1992 | CN1015287B Sylinder shape step-selector for variable transformer |
| 12/25/1991 | CN2091489U Voltage-dividing regulating transformer |
| 12/11/1991 | CN2090570U Oblique laminated variable autotransformer |
| 12/04/1991 | CN2090103U High current take-off pressure regulating switch |
| 12/04/1991 | CN1015036B Cylindrical step-selector of variable transformer |
| 11/06/1991 | CN1056008A Multifunctional ac voltage-stabilized source |
| 10/30/1991 | CN2087810U Multi-tap series reactor for high-voltage parallel capacitor |
| 10/23/1991 | CN2087378U Adjustable reactor without magnetic core |
| 10/09/1991 | CN2086449U No-excitation shunting switch |
| 09/18/1991 | CN2085090U Compound autotransformer-type voltage regulator |
| 08/28/1991 | EP0443342A1 Method for controlling the energy transfer in a static converter, static energy converter for carrying out such method and electric power supply using such converter |
| 08/28/1991 | CN1013718B Load selector with preselector for transtat |
| 08/14/1991 | CN2082893U Planar sliding induction voltage regulator |
| 08/07/1991 | CN2082453U Compound type branch switch of air load |
| 07/30/1991 | CA1287099C Electrically controllable inductive device |
| 07/23/1991 | US5034578 Tap-changing bridge contact for transformer |
| 07/03/1991 | CN2080214U Branch switch without excitation |
| 05/29/1991 | EP0428842A2 Energy accumulator for a breaker of an on-load tap changer in step-down transormers |
| 05/22/1991 | CN2077582U Multifunctional ballast featured by low-voltage starting and light regulating |
| 05/22/1991 | CN2077580U Structure of regulatable supervoltage transformer with three windings |
| 05/15/1991 | EP0400112A4 High-voltage winding for core-form power transformers |
| 05/08/1991 | DE3936937A1 Winding set for moulded resin transformer - has main and auxiliary winding for each phase axially aligned along respective core limbs |
| 05/02/1991 | EP0424632A1 Device and method for switching on-load tap changers |
| 05/02/1991 | EP0424631A1 Cylindrical on-load tap changer for step-down transformers |
| 05/02/1991 | DE3935867A1 Load switching for stage switching system - has contact sequence providing efficient changeover |
| 05/01/1991 | CN2076267U Voltage-regulating winding structure for delta connection transformer |
| 04/09/1991 | US5006784 Thyristor on-load change-over switch |
| 04/03/1991 | CN2074492U 双容量变压器 Double the capacity of the transformer |
| 03/19/1991 | US5001401 Dual voltage ballast |
| 03/13/1991 | CN2073153U Ballast quick starter for electromagnetic fluorecent lamp |
| 03/06/1991 | EP0415044A2 Contact arrangement for tap-changers or tap transformers |
| 02/20/1991 | CN2071864U Low-radiation electronic ballast |
| 02/19/1991 | US4994952 Low-noise switching power supply having variable reluctance transformer |
| 02/19/1991 | CA1280474C Transformer tap changer |
| 02/06/1991 | CN2070945U Hf magnetic resonance vibration voltage-stabilizing transformer |
| 01/23/1991 | EP0409431A2 Conductivity state monitor for thyristor transformer tap switching devices |
| 01/23/1991 | CN1011298B Transformer type arc welder with tapping |
| 01/11/1991 | CA2020766A1 Multi-tap primary coil for gas discharge lamps |
| 01/10/1991 | DE4019822A1 HV pulse generating circuit - has magnetic pulse compression circuit with saturable main choke, and resetting circuit |
| 01/10/1991 | CA2015483A1 Conductivity state monitor for thyristor transformer tap switching devices |
| 01/02/1991 | CN1011098B Transformer tap changer |
| 12/25/1990 | US4980794 Electromagnetic contactor with lightweight wide range current transducer with sintered powdered metal core |
| 12/19/1990 | CN1010902B Step transformer with central tapping |
| 12/18/1990 | US4978815 Load selector for step transformers |
| 12/05/1990 | EP0400112A1 High-voltage winding for core-form power transformers |
| 11/29/1990 | WO1990014675A1 Load-reversing switch for voltage regulating transformers |
| 11/28/1990 | CN2066614U T shape binding transformer of continuous adjusting voltage |
| 11/07/1990 | CN2065354U Symmetrical magnetic-saturation voltage regulator |
| 10/10/1990 | EP0391325A1 Container for accomodating electrical apparatus |
| 10/10/1990 | CN2063683U Track transformer for middle ac continuous track circuit |
| 09/19/1990 | CN2062483U Non-exciting shunting switch |
| 09/12/1990 | CN2062143U Light stepless regulator for fluorescent lamp |
| 09/12/1990 | CN2062111U Adjustable transformer |
| 09/12/1990 | CN2062110U Track transformer for small ac continuous track circuit |
| 08/22/1990 | CN2060938U Adjustable transformer with compound switch |
| 08/21/1990 | US4951024 High efficiency saturating reactor for starting a three phase motor |
| 07/19/1990 | DE3900890A1 Ferromagnetic energy converter and method for generating AC |
| 07/18/1990 | CN1008849B 35-110kv on-load shunting switch with bridge connection |
| 07/03/1990 | US4939319 Step selector for a stepped transformer |
| 06/19/1990 | US4935586 Cylindrical step selector for stepped transformers |
| 06/14/1990 | WO1990006584A1 High-voltage winding for core-form power transformers |
| 06/06/1990 | EP0371376A2 Tap selector for step-down transformers with concentric actuating shafts |
| 06/06/1990 | EP0371375A2 Cylindrical tap selector for step-down transformers actuated in one step |
| 06/05/1990 | US4931599 Step selector for a stepped transformer |
| 05/02/1990 | EP0365619A1 Non-saturating magnetic amplifier controller |
| 04/24/1990 | CA1268219A1 Ac power supply with improved cooling means |
| 04/11/1990 | CN1041252A Magnetic-brake tech and its application |
| 04/11/1990 | CN1007570B Dual tunning low energy consumption filtering device and method |
| 03/28/1990 | CN1040884A Sylinder shape step-selector for variable transformer |
| 03/28/1990 | CN1040754A Tapped transformer type arc welding machine |
| 03/14/1990 | CN1040455A Cylindrical step-selector of variable transformer |
| 03/07/1990 | EP0356897A2 Cylindrical tap selector for tap transformers with an insulating bearing assembly for driving shafts |
| 03/06/1990 | US4906859 Power supply circuit with symmetrically tapped auto-transformer |
| 02/28/1990 | EP0355814A2 A force storage mechanism in an on-load tap changer |
| 02/27/1990 | US4904923 Energy transfer |
| 02/20/1990 | US4902942 Controlled leakage transformer for fluorescent lamp ballast including integral ballasting inductor |
| 02/14/1990 | EP0354425A1 Cylindrical tap selector with a contact bridge guided by a cantilever made of insulating material |