| Patents for H01F 29 - Variable transformers or inductances not covered by group (3,889) |
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| 09/22/2004 | CN1530973A Electronic element and producing method thereof |
| 09/15/2004 | EP1456728A1 Device with controllable impedance |
| 09/15/2004 | EP0956571B1 Transformer with voltage regulating means |
| 09/15/2004 | EP0744757B1 D.c. reactor |
| 09/15/2004 | CN2641787Y Multilayer no-excitation drum shape tap changer |
| 09/15/2004 | CN1167091C Connection mode between on-load voltage regulating switch and secondary side of power transformer |
| 09/14/2004 | US6791446 Inductance component comprising a permanent magnet greater in sectional area than a magnetic path and disposed in a magnetic gap |
| 09/09/2004 | US20040174240 Electrical device and method of producing the same |
| 09/08/2004 | CN2638903Y Three-phase crystal brake tube ring-shaped core DC arc-welding machine |
| 09/08/2004 | CN1165923C Switch for converter for tapping on load |
| 09/07/2004 | US6788180 Controllable transformer |
| 09/01/2004 | EP1452076A1 Programmable system for stabilising and regulating voltage in particular for the improved management of lighting units using fluorescent bulbs and like |
| 09/01/2004 | CN2638214Y Excitationless positive and negative adjusting tap changer |
| 09/01/2004 | CN2638213Y Double layer contact head composite type middle part voltage regulating loading tap changer |
| 08/25/2004 | EP1449043A1 Controllable transformer |
| 08/25/2004 | CN2636285Y Static loaded voltage regulating switch for power transformer |
| 08/25/2004 | CN1163922C Vacuum valve type load time-division contact switching device |
| 08/24/2004 | US6782513 High power factor integrated controlled ferroresonant constant current source |
| 08/18/2004 | EP1446862A1 Motionless electromagnetic generator |
| 08/18/2004 | CN2634517Y Inductive voltage stabilizer |
| 08/11/2004 | CN1519868A Key type on load tap changer |
| 08/11/2004 | CN1161802C Controllable inductor |
| 08/11/2004 | CN1161801C Electronic load tap switch |
| 08/04/2004 | CN2631016Y Excitation-free tube type switch with internal tube extraction structure |
| 08/04/2004 | CN2631015Y Excitation-free tube type switch with external closed internal-circulating structure |
| 07/29/2004 | WO2004064084A2 Self-damped inductor |
| 07/29/2004 | DE202004000448U1 Voltage tap adaptor for medium voltage (MV) power transformer, in which power semiconductor electronic appliance, raised to MV potential, is directly fitted in region of TAPs |
| 07/21/2004 | CN1158680C 变压器/电抗器 Transformer / reactor |
| 07/15/2004 | US20040135661 Magnetically controlled inductive device |
| 07/15/2004 | DE10260246A1 Spulenanordnung mit veränderbarer Induktivität Coil arrangement with variable inductance |
| 07/14/2004 | EP1325507B1 Energy accumulator for a sequence switch |
| 07/07/2004 | CN2624496Y Novel reactance filtering electricity saver |
| 07/07/2004 | CN1156861C Controllable inductor |
| 07/01/2004 | WO2004042911A3 Method and system for controlling an assembly of magnetically independent transformers, and data recording media comprising instructions for executing the method |
| 07/01/2004 | US20040124826 Voltage converter utilizing independently switched inductors |
| 06/24/2004 | US20040120083 Superconducting shielded core reactor with reduced AC losses |
| 06/24/2004 | US20040119577 Coil arrangement with variable inductance |
| 06/23/2004 | EP1431986A1 Coil assembly with variable inductance |
| 06/23/2004 | CN2621332Y Tubular type switch without field |
| 06/23/2004 | CN1506986A Capacity-regulating transformer |
| 06/22/2004 | US6753751 Magnetic core including magnet for magnetic bias and inductor component using the same |
| 06/16/2004 | EP1429352A1 Electrical device and method of producing the same |
| 05/26/2004 | CN1499542A Tranformer of voltage regulation and adjustment through control of main magnetic flux |
| 05/21/2004 | WO2004042911A2 Method and system for controlling an assembly of magnetically independent transformers, and data recording media comprising instructions for executing the method |
| 05/13/2004 | WO2004040601A1 Controlled shunt reactor |
| 05/13/2004 | WO2004040600A1 Transformer |
| 05/13/2004 | WO2004039274A1 System for, and method of, heating a biological site in a patient's body |
| 05/13/2004 | CA2503765A1 System for, and method of, heating a biological site in a patient's body |
| 05/11/2004 | US6734772 Method and apparatus for providing selectable output voltages |
| 05/11/2004 | US6734771 Inductor component having a permanent magnet in the vicinity of magnetic gap |
| 05/06/2004 | EP0888628B1 Transformer/reactor |
| 05/05/2004 | CN2614375Y 单相牵引变压器 Single-phase traction transformers |
| 04/15/2004 | US20040070359 Arrangement for automatically influencing a mains supply and motor drive for said arrangement |
| 04/14/2004 | CN1489698A Tap changer condition diagnosing |
| 04/14/2004 | CN1489697A Tap changer condition diagnosing |
| 04/06/2004 | US6717504 Magnetic core including bias magnet and inductor component using the same |
| 03/31/2004 | EP1402621A2 Arrangement for automatically influencing a mains supply and motor drive for said arrangement |
| 03/31/2004 | CN1485701A Power transformer static state load-bearing voltage regulating switch |
| 03/30/2004 | CA2284958C Output choke for d.c. welder and method of using same |
| 03/25/2004 | WO2004025703A2 Active method and system of establishing electrical contact |
| 03/25/2004 | US20040057491 Condition diagnosing |
| 03/25/2004 | US20040057255 Power generation within a motionless electromagnetic generator |
| 03/11/2004 | US20040046539 Active method and system of establishing electrical contact |
| 03/03/2004 | EP0888662B1 Electromagnetic device |
| 03/03/2004 | CN1479966A System of automatically influencing electric net and motor drive for said system |
| 02/26/2004 | US20040036454 Signal transformer and method for operating such a signal transformer |
| 02/25/2004 | EP1391900A1 Signal transformer as well as method of operation of such a signal transformer |
| 02/25/2004 | EP1082735A4 Variable inductor |
| 02/25/2004 | CN1478286A Thyristor tap changer |
| 02/19/2004 | US20040032699 Thyristor tap changer |
| 02/19/2004 | US20040032315 Variable inductor responsive to AC current level |
| 02/19/2004 | DE20318061U1 Circuit for supplying an odd number of parallel or series switched loads with electricity provides equal energy to the loads in series and parallel configurations |
| 02/18/2004 | CN1139084C Magnetic core for saturable reactor, multi-output switching regulator and computer having multi-output switching regulator |
| 02/11/2004 | CN1138286C Transformer |
| 02/05/2004 | US20040021449 Tap changer condition diagnosing |
| 02/04/2004 | CN2602473Y Load-ratio voltage transformer |
| 02/04/2004 | CN1473337A Permanent magnet, magnetic core having magnet has bias magnet and inductance parts using the core |
| 01/22/2004 | US20040012472 Flux control for high power static electromagnetic devices |
| 01/22/2004 | US20040011631 Energy accumulator for a sequence switch |
| 01/21/2004 | CN1470063A Energy accumulator for a sequence switch |
| 01/15/2004 | DE10227841A1 Schaltungsanordnung zur Erzeugung einer Röntgenröhrenspannung Circuit arrangement for generating an X-ray tube voltage |
| 01/14/2004 | EP1380041A1 Load selector |
| 01/07/2004 | CN2598110Y Closed rolled core step-up transformer |
| 01/07/2004 | CN1134035C Selector switch |
| 01/06/2004 | US6674320 System and method for orthogonal inductance variation |
| 12/31/2003 | WO2004001778A1 Circuit arrangement for generating an x-ray tube voltage |
| 12/25/2003 | US20030234698 Circuit component and transformer device with controllable impedance and with systems equipped with such devices |
| 12/25/2003 | US20030234639 Multi-site spare transformer |
| 12/17/2003 | CN2593329Y Key type on-load tap changer |
| 12/17/2003 | CN2593328Y Contactless swtich on-load voltage-regulating transformer |
| 12/16/2003 | US6664881 Efficient, low leakage inductance, multi-tap, RF transformer and method of making same |
| 12/10/2003 | CN2591739Y Driving device for composite loading tap changer |
| 12/10/2003 | CN1130738C Contact assembly on preselector |
| 12/04/2003 | WO2003100798A1 Current collector especially for a regulating transformer |
| 11/25/2003 | US6653924 Transformer with controlled interwinding coupling and controlled leakage inductances and circuit using such transformer |
| 11/25/2003 | US6652717 Time averaging radio frequency voltage distributions |
| 11/19/2003 | EP0888661B1 An electric high voltage ac generator |
| 11/19/2003 | CN1457063A Voltage regulating and rectifying transformer for linear descending third transformer |
| 11/13/2003 | US20030210122 Inductance with a midpoint |
| 11/05/2003 | EP1358500A1 Tap changer condition diagnosing |