| Patents for H01F 29 - Variable transformers or inductances not covered by group (3,889) |
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| 07/15/1987 | CN86204235U Multipurpose voltage regulator |
| 07/07/1987 | US4678986 Electric transformer with selectively energized modular circuits |
| 07/07/1987 | US4678927 Circuit arrangement for large power transformers |
| 06/24/1987 | CN86100524A Contactual voltage-regulating autotransformer with multilayer winding |
| 06/16/1987 | US4673850 Universal motor control system |
| 06/04/1987 | DE3541888A1 Manual drive for off-load tap changers of tapped transformers |
| 04/22/1987 | CN85203415U Adjustable inductive resisfance reactor |
| 04/02/1987 | DE3534843A1 Winding arrangement for transformers and inductors (chokes) having an upper voltage winding consisting of in each case at least one main winding and one tapped winding |
| 04/01/1987 | EP0216500A1 Electromagnetic induction apparatus |
| 04/01/1987 | EP0216125A1 On-load tap changing transformer |
| 03/24/1987 | US4651412 Electric transformer and method for the manufacture of the transformer |
| 03/17/1987 | US4651024 Electromagnetically actuated high DC current switch |
| 03/12/1987 | WO1987001505A1 Inductive, electrically-controllable component |
| 03/11/1987 | EP0213461A1 Step transformer with a centre tap |
| 03/11/1987 | CN85105863A 35-110kv on-load shunting switch with bridge connection |
| 03/04/1987 | CN86104379A Step transformer with central tapping |
| 03/03/1987 | US4647731 Transformer crankshaft load selector |
| 02/18/1987 | CN85106176A Rotating transformer |
| 01/24/1987 | CN86101101A Wearless clip-type branch switch without excitation |
| 01/14/1987 | CN85105310A On-load tap-switch with crankshaft |
| 12/31/1986 | CN86201937U Combined voltage-tuning transformer |
| 12/30/1986 | EP0205754A2 Ferromagnetic core for an inductive position sensor |
| 11/11/1986 | US4622513 Gating of the thyristors in an arcless tap changing regulator |
| 11/04/1986 | US4621298 Dual voltage distribution transformer with internal varistor surge protection |
| 10/29/1986 | EP0199494A2 Energy storage apparatus for a load tap selector |
| 10/28/1986 | US4620144 Self-controlled variable inductor with air gaps |
| 10/22/1986 | EP0198314A1 Protective choke for a controlled rectifier |
| 10/22/1986 | CN86100045A Harmonic inductor for generation of an energy conserving power wave |
| 09/24/1986 | CN85203059U 可调电抗器 Adjustable Reactor |
| 09/10/1986 | EP0194163A1 Self-controlled variable inductance with gaps, and electrical system having such an inductance |
| 09/10/1986 | EP0096058B1 Electric transformer and method for making it |
| 09/10/1986 | CN86102005A Duplex-direction on load voltage regulating method and relevant device |
| 09/03/1986 | EP0192915A1 Tansformer with a turn ratio variable while in operation |
| 08/20/1986 | EP0191398A1 Oil-filled tap changer assembly with oil expansion vessel |
| 08/13/1986 | EP0190918A1 Position sensor/tachometer |
| 08/05/1986 | US4604503 Change-over switch for an on-load tap changer |
| 07/16/1986 | CN86100229A Self-controlled variable inductor with air gaps |
| 07/02/1986 | CN85107436A Vacuum on-load tap-switch with secondary energy-storage device |
| 06/25/1986 | EP0185530A2 Three-phase on-load tap changer |
| 06/18/1986 | CN85203768U Salf-bath furnace with double electrodes and its self-excited starting, continuously temperature-adjusting unit |
| 06/17/1986 | US4595806 On-load tap changer |
| 06/04/1986 | EP0183015A1 Current-limiting device |
| 05/13/1986 | US4588971 Electric transformer with annular coil forms |
| 05/10/1986 | CN85107459A Frequency sensitive slip regulator with short circuit winding |
| 04/22/1986 | US4584550 Contact piece for establishing delta circuits on three-legged transformers |
| 04/09/1986 | EP0177323A2 On-load tap changing device |
| 03/18/1986 | US4577146 Variable autotransformer having an indexed stepping brush |
| 03/04/1986 | CA1201478A1 Microprocessor controlled voltage regulation transformer |
| 02/18/1986 | US4571499 Circuit arrangement for switchover of load between different sources of alternating voltage |
| 02/04/1986 | US4568902 Contact piece for air-cooled transformers having conductive lines |
| 01/21/1986 | CA1199694A1 Split structure type transformer |
| 01/15/1986 | EP0168176A1 Tap changer |
| 01/08/1986 | EP0166844A1 Tap selector with cranked shaft |
| 12/31/1985 | US4562338 Heating power supply apparatus for polycrystalline semiconductor rods |
| 12/24/1985 | US4560970 Variable transformer with multi-layer coil |
| 11/06/1985 | EP0160125A2 On-load tap changer for tapped transformer |
| 10/29/1985 | US4550285 Load-switching circuit for antiparallel thyristor networks and a tapped transformer |
| 10/10/1985 | CN85103560A Three-phase saturating reactor with seven legged laminated core |
| 09/18/1985 | EP0154697A1 High-voltage winding with constrained potential distribution for transformers |
| 09/10/1985 | US4540934 Device for the fine adjustment of the output voltage of multi-phase regulating transformers |
| 09/10/1985 | US4540931 Variable transformer and voltage control system |
| 08/21/1985 | EP0151740A2 Load changer for tapped transformers |
| 08/20/1985 | US4536733 High frequency inverter transformer for power supplies |
| 08/06/1985 | US4533892 Split structure type transformer |
| 07/31/1985 | EP0150132A2 On-load tap changer |
| 07/31/1985 | EP0150130A2 On-load tap changer |
| 07/30/1985 | US4532582 Voltage regulator system using magnetic controllers |
| 07/03/1985 | EP0147125A1 On-load tap changer |
| 07/03/1985 | EP0146818A2 Magnetic amplifier and speed control circuit for motors and its use |
| 06/26/1985 | EP0146396A2 Change-over switch for an on-load tap changer |
| 06/19/1985 | EP0144561A1 Toothed reluctance synchro/resolver |
| 06/18/1985 | US4524341 Transformer with series-parallel-series winding between split winding |
| 06/04/1985 | US4520818 High dielectric output circuit for electrosurgical power source |
| 05/15/1985 | EP0141303A2 Step transformer with a cylinder of insulating material for an on-load tap-changer |
| 05/15/1985 | EP0141296A1 Circuit arrangement for the wiring of high power transformers |
| 05/08/1985 | EP0140209A1 Tapped transformer with a non solidly earthened neutral point |
| 03/26/1985 | CA1184621A1 Transformer, and method of manufacture |
| 02/19/1985 | US4500833 Switched mode power supply transformer |
| 02/19/1985 | US4500832 Electrical transformer |
| 02/13/1985 | EP0132662A1 Load selector for tapped transformers |
| 01/29/1985 | US4496923 Electrical device with improved heat dissipation |
| 01/02/1985 | EP0129839A1 Variable transformer and voltage control system |
| 01/01/1985 | US4491819 Magnetically biased inductor |
| 11/20/1984 | US4484169 Transformer apparatus with -superimposed insulated switch and transformer units |
| 11/14/1984 | EP0125085A1 Variable inductor mechanism |
| 11/14/1984 | EP0124904A2 Tap changing switch |
| 10/31/1984 | EP0123176A1 Fixed contact to be arranged in insulating cylinders of tap changers for transformers |
| 10/09/1984 | CA1175877A1 Pincushion distortion correction apparatus |
| 10/03/1984 | EP0120379A1 Load changer for switching step windings of a three-phase transformer |
| 09/12/1984 | EP0118269A1 Electrical transformer |
| 09/12/1984 | EP0118268A1 High dielectric output circuit for electrosurgical power source |
| 09/11/1984 | US4471334 On-load tap-changing transformer |
| 09/11/1984 | US4471271 Self-regulating saturating core television receiver power supply |
| 09/04/1984 | CA1173903A1 Thyristor tap changer arrangement |
| 08/29/1984 | EP0116748A1 On-load tap changer |
| 08/01/1984 | EP0114648A2 Onload tap-changing transformer |
| 07/10/1984 | US4459653 Apertured transformer and inverter using same |
| 07/03/1984 | US4458168 Toothed reluctance synchro/resolver |
| 06/27/1984 | EP0111991A2 Stepping-brush electrical device |
| 06/13/1984 | EP0110269A1 Contact device for the step selectors of step transformers |