| Patents for H01F 29 - Variable transformers or inductances not covered by group (3,889) |
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| 07/07/2005 | US20050145611 Power source for plasma device |
| 07/07/2005 | DE102004056943A1 Zündspule mit Magnetflussverringerndem Innenaufbau Ignition coil with Magnetflussverringerndem internal structure |
| 06/30/2005 | US20050138797 Method for manufacturing a multi-site spare 3-phase transformer |
| 06/29/2005 | EP1548922A1 Switching power supply circuit |
| 06/29/2005 | CN1208793C Voltage regulating and rectifying transformer for linear descending third transformer |
| 06/15/2005 | CN1206673C Thyristor tap changer |
| 06/14/2005 | US6906608 Magnetic core including magnet for magnetic bias and inductor component using the same |
| 06/08/2005 | CN2704094Y Multi-stage on-load automatic voltage-regulating transformer |
| 06/02/2005 | WO2005050341A1 Voltage regulator including controllable transformer |
| 06/02/2005 | US20050116804 Magnetically biasing bond magnet for improving DC superposition characteristics of magnetic coil |
| 06/01/2005 | CN2703314Y Uninterrup electric power voltage regulating transformer |
| 05/26/2005 | US20050110605 Controllable transformer |
| 05/26/2005 | US20050110604 Ignition coil having magnetic flux reducing inner structure |
| 05/25/2005 | CN1202935C Output choking coi lfor use on D.C. welding machine and method for using same |
| 05/18/2005 | CN1618049A Device with controllable impedance |
| 05/12/2005 | US20050099741 Tap changer monitoring |
| 05/11/2005 | CN1615462A Controllable transformer |
| 05/10/2005 | US6891303 High voltage AC machine winding with grounded neutral circuit |
| 05/03/2005 | US6888268 Energy storage device |
| 04/28/2005 | WO2005038831A1 High-voltage transformer |
| 04/27/2005 | CN2696092Y Controllable transformer |
| 04/27/2005 | CN2696091Y Cylinder excitation-free bar tap charger |
| 04/27/2005 | CN1199207C Magnetron drive step-up transformer and transformer of magnetron drive power supply |
| 04/26/2005 | US6885272 Permanent magnetic core device |
| 04/21/2005 | WO2005036568A1 Controllable inductive device |
| 04/21/2005 | CA2537700A1 Controllable inductive device |
| 04/20/2005 | EP1524677A1 A charger |
| 04/14/2005 | WO2005034160A1 Slider for selecting coil voltage and locking the coil in place |
| 04/14/2005 | WO2005034152A2 System and method for connecting a removable coil to fixed coil terminals |
| 04/14/2005 | US20050077991 Landscape lighting transformer having increased loading features |
| 04/13/2005 | CN2692810Y Load voltage-regulating switch for regulating voltage in medium of transformer |
| 04/12/2005 | US6879232 Wide ratio autotransformer-type current ranging |
| 04/12/2005 | CA2327014C Method and apparatus for providing selectable output voltages |
| 04/07/2005 | WO2005031771A1 Ignition coil for a spark ignition engine |
| 04/05/2005 | US6874224 Method for manufacturing a multi-site spare three-phase transformer |
| 03/31/2005 | US20050068145 Slider for selecting coil voltage and locking the coil in place |
| 03/31/2005 | US20050068132 System and method for connecting a removable coil to fixed coil terminals |
| 03/30/2005 | CN1601668A Super-large volume loading voltage regulation autotransformer |
| 03/30/2005 | CN1601667A Method of lowering impact induction potential of large volume autotransformer |
| 03/24/2005 | WO2005026860A2 Preventive maintenance tapping and duty cycle monitor for voltage regulator |
| 03/10/2005 | WO2005022573A1 Method for monitoring insulating oil |
| 03/09/2005 | CN1591711A Rotary iron cored type adjustable reactor |
| 02/24/2005 | DE10331866A1 Einrichtung zur Steuerung einer Spulenanordnung mit elektrisch variierbarer Induktivität Means for controlling a coil arrangement with diversifiable electrical inductance |
| 02/23/2005 | EP1508147A1 Current collector especially for a regulating transformer |
| 02/23/2005 | CN2681308Y Off circuit tap changer |
| 02/23/2005 | CN2681302Y On-load smooth regulating transformer |
| 02/22/2005 | US6859128 Output choke for D.C. welder and method of using same |
| 02/17/2005 | WO2005015724A1 Switching power supply circuit |
| 02/16/2005 | CN2679811Y Power source able to convert starting/operating for dynamo under large load |
| 02/16/2005 | CN1582524A Motionless electromagnetic generator |
| 02/15/2005 | US6856231 Magnetically biasing bond magnet for improving DC superposition characteristics of magnetic coil |
| 02/15/2005 | US6856122 Thyristor tap changer |
| 02/09/2005 | CN2678083Y Small current switchover autoconnected streetlight transformer |
| 02/03/2005 | DE10334688B3 Monitoring insulating oil for fouling in load step switches involves determining cumulative spark energy, comparing with limit value, generating message if limit or percentage thereof exceeded |
| 02/02/2005 | CN2676373Y 三相滤波器 Three-phase filter |
| 02/01/2005 | US6849813 Step switch with selector |
| 01/26/2005 | CN2674612Y Three-phase sliding clock rolling combined non-excitation tap changer |
| 01/26/2005 | CN1571082A Double-voltage transformer |
| 01/20/2005 | US20050013084 Means for controlling a coil arrangement with electrically variable inductance |
| 01/20/2005 | US20050013065 Integral transformer junction module |
| 01/19/2005 | CN2672820Y Lateral flux controllable reactor |
| 01/19/2005 | CN2671737Y Thyrister circular iron core AC/DC arc welder |
| 01/13/2005 | US20050006367 Power source for high current welding |
| 01/13/2005 | US20050006366 Transformer module for a welder |
| 01/13/2005 | DE10328986A1 Compensation of temperature coefficient of coil constant of an electromagnetic solenoid has current flow of additional coil controlled to be proportional to current in main coil and to temperature of windings of main coil |
| 01/12/2005 | EP1496527A1 Transformer module for a welder |
| 01/12/2005 | CN2671230Y Active voltage regulator for large non-excited transformer |
| 01/12/2005 | CN2671200Y Magnetic valve reactance dynamic thysitor reactive compensator |
| 01/11/2005 | CA2462464A1 Transformer module for a welder |
| 01/05/2005 | CN1560883A Start and operation changable power supply unit for large loading of electric machine |
| 01/05/2005 | CN1183559C Tap converter |
| 01/04/2005 | US6838863 Voltage converter utilizing independently switched inductors |
| 01/04/2005 | US6838629 Energy accumulator for a sequence switch |
| 12/30/2004 | US20040263307 Adjustable coilform for variable inductance |
| 12/28/2004 | CA2184371C Switch-over arrangement for load switches of tap changers and for load selectors |
| 12/22/2004 | CN1181514C Tapping change-over operation control mechanism for loaded tapping switch and its control method |
| 12/15/2004 | CN2664132Y Double layer tapping switch for transformer winding thermometer |
| 12/15/2004 | CN1555070A Excitation-free cage shape tapping switch |
| 12/08/2004 | CN2662419Y Fixed contact array of excitation free tube type tapping switch |
| 12/07/2004 | US6828894 Isolation transformer arrangement |
| 12/07/2004 | CA2344815C Permanent magnetic core device |
| 12/02/2004 | US20040239463 Variable inductor |
| 12/01/2004 | CN1551257A Electric component and method of producing the same |
| 11/23/2004 | US6822363 Electromagnetic device |
| 11/17/2004 | CN2657176Y Moving contact head mechanism of excitation less pipe type switch |
| 11/11/2004 | US20040222874 Electric component and method of producing the same |
| 11/10/2004 | EP1475811A2 Electric component and method of producing the same |
| 11/03/2004 | CN2653656Y Vacuum loaded shunt switch |
| 10/21/2004 | US20040207503 Self-damped inductor |
| 10/21/2004 | US20040207500 Magnetic core including magnet for magnetic bias and inductor component using the same |
| 10/20/2004 | CN1172560C Lateral magnetic inducting heater with varying width of magnetic path |
| 10/20/2004 | CN1172329C Curved compensating transformer and its phase-shift voltage regulating method |
| 10/13/2004 | CN2647488Y Converter for AC electric welder |
| 10/07/2004 | US20040196128 Electrical reactor assembly having center taps |
| 10/06/2004 | CN2646840Y Rearrangement on-load switch for transformer winding |
| 10/05/2004 | US6801421 Switchable flux control for high power static electromagnetic devices |
| 09/30/2004 | DE10311071A1 Magnetanordnung Magnet assembly |
| 09/23/2004 | WO2004081955A1 Magnet arrangement |
| 09/23/2004 | US20040184292 Systems and methods for driving large capacity AC motors |
| 09/22/2004 | CN2643457Y Constant voltage transformer for pumping unit |