| Patents for H01F 29 - Variable transformers or inductances not covered by group (3,889) |
|---|
| 05/06/1980 | US4201938 Voltage regulator which eliminates arcing during tap changes |
| 04/30/1980 | EP0010502A1 Variable inductance |
| 04/29/1980 | CA1076667A1 Variable flux transformer |
| 04/22/1980 | US4198863 Electromagnetic torsional stiffness element |
| 04/02/1980 | EP0009287A1 Electrical apparatus comprising a series of voltage taps and a tap selector and/or a circuit breaker |
| 02/19/1980 | US4189672 Variable transformer method and apparatus for preventing short-circuit current flow |
| 01/22/1980 | US4185177 Latch operated tap changing switch for transformer regulating system |
| 01/08/1980 | US4183001 Transformers for induction heating equipment |
| 12/18/1979 | CA1068340A1 Switching arrangement for transformer windings |
| 12/04/1979 | US4177418 Flux controlled shunt regulated transformer |
| 10/23/1979 | US4172245 Adjustable transformer |
| 10/23/1979 | CA1065028A1 Air core reactor |
| 10/17/1979 | EP0004662A1 Oil-break tap selectors for tap changers of tap transformers |
| 09/18/1979 | US4168461 Voltage regulator providing wide range of voltage regulation |
| 09/11/1979 | US4167719 Variable ratio transformer |
| 09/04/1979 | US4167037 Apparatus for DC/AC power conversion by electromagnetic induction |
| 09/04/1979 | US4166992 Symmetrical structure for shunt controlled regulated transformer |
| 08/14/1979 | US4164723 Shunt release and locking structure |
| 08/07/1979 | US4163962 Universal impedance power apparatus |
| 07/31/1979 | US4163190 Apparatus for control of electrical current by electromagnetic induction |
| 07/24/1979 | US4162522 Apparatus for frequency conversion by electromagnetic induction |
| 07/24/1979 | US4162441 Apparatus for control of DC power by electromagnetic induction |
| 07/17/1979 | US4161772 Conversion and control of electrical energy by electromagnetic induction |
| 07/03/1979 | US4160224 Transformer |
| 07/03/1979 | US4160193 Metal vapor electric discharge lamp system |
| 05/22/1979 | US4156222 Transformer with divided primary |
| 05/22/1979 | US4156174 Phase-angle regulator |
| 05/15/1979 | US4155034 Saturable reactors with feedback |
| 04/18/1979 | EP0001387A1 Tap changer with a screening electrode |
| 04/03/1979 | CA1051985A1 High-voltage transformer comprising a foil winding |
| 03/20/1979 | CA1051104A1 Leakage reactance transformer |
| 02/20/1979 | CA1049097A1 Cross-field ground fault sensor |
| 01/16/1979 | CA1046607A1 Rotary transducer for sensing rotation of different diameter shafts having uniform arcuate surfaces |
| 12/19/1978 | US4130789 Tap changing voltage regulator which eliminates preventive autotransformer |
| 12/12/1978 | USRE29860 Rotary potentiometer with speed reduction gearing |
| 10/31/1978 | US4123736 Leakage reactance transformer |
| 09/26/1978 | US4117438 Contactless keyswitch for keyboards |
| 09/26/1978 | CA1039373A1 Saturable reactor for pincushion distortion correction |
| 09/05/1978 | US4112404 Variable flux transformer |
| 09/05/1978 | US4112347 Conversion and control of electrical energy by electromagnetic induction |
| 08/29/1978 | CA1037604A1 Housing structure and magnetic biasing magnetic bubble memories |
| 08/15/1978 | US4107635 Arc welding machine |
| 08/01/1978 | US4104716 Saturable magnetic device for regulating commutating or converting an electric current from AC to DC or vice versa |
| 07/25/1978 | US4103221 Inductor with plurality of magnet pieces in air gap |
| 06/13/1978 | US4095177 Transducer |
| 05/16/1978 | US4090225 Fail-safe circuit for tap-changing transformer regulating system |
| 04/25/1978 | US4086552 High-voltage transformer comprising a foil winding |
| 04/25/1978 | US4086551 Shunt positioning device |
| 03/28/1978 | US4081741 On-load tap changer |
| 12/06/1977 | US4061963 Load tap changer system |
| 10/04/1977 | US4052686 Flexible position probe assembly |
| 09/20/1977 | US4049946 Power supply for electric arc welding |
| 09/13/1977 | US4048604 Magnetic core |
| 09/13/1977 | US4048602 Universal impedance power apparatus |
| 09/06/1977 | US4047139 Transformers of large capacity for ultra-high voltages |
| 08/09/1977 | US4041431 Input line voltage compensating transformer power regulator |
| 07/12/1977 | US4035717 Electrical transformer utilizing a no load tap changer |
| 06/28/1977 | US4032874 Reactor core |
| 06/28/1977 | US4032840 Adjustable transformer |
| 06/28/1977 | US4032833 Chopper control device |
| 06/21/1977 | US4031496 Variable inductor |
| 05/24/1977 | US4025864 Direct current modulator for providing variable double frequency electrical power to a load |
| 05/10/1977 | US4023090 Zagreb electrical circuit |
| 05/03/1977 | US4021729 Cross-field ground fault sensor |
| 04/26/1977 | US4020440 Conversion and control of electrical energy by electromagnetic induction |
| 04/19/1977 | US4019123 Magnetic amplifier arrangements |
| 03/22/1977 | US4013911 Displacement - electricity transducer |
| 03/22/1977 | US4013847 No-load tap changer switch with rack and pinion gear operating mechanism |
| 02/22/1977 | US4009460 Inductor |
| 02/08/1977 | US4007332 Artificial reverberation system |
| 11/09/1976 | US3991393 Servomechanism control cylinder |
| 09/07/1976 | US3979706 Shielded inductance coil with trimmer |
| 08/31/1976 | US3978395 Variable voltage devices |
| 08/24/1976 | US3976965 Paired coiled conductors compact-long life |
| 07/06/1976 | US3968465 Inductor and method for producing same |
| 07/06/1976 | US3968426 Method of A.C. insulation testing utilizing a variable inductive reactor in parallel with a test specimen |
| 06/08/1976 | US3962622 High-voltage generator for an X-ray diagnostic apparatus |
| 05/18/1976 | US3958203 Positional transducer utilizing magnetic elements |
| 05/18/1976 | US3958196 Coil tuning apparatus |
| 05/04/1976 | US3955166 Pulse producing devices |
| 04/06/1976 | US3949339 Angular position transducer |
| 03/30/1976 | US3947794 Magnetic core assemblies with adjustable reluctance as a function of temperature |
| 03/16/1976 | US3944913 System for effecting tap changes of tapped transformer windings by means of thyristors |
| 03/09/1976 | US3943435 Transformer having improved voltage and phase characteristics |
| 02/24/1976 | US3940662 Saturable reactor for pincushion distortion correction |
| 01/27/1976 | US3935407 Multiphase vacuum switch assembly having cam operated spring charging drive mechanism with lost motion connection |
| 01/20/1976 | US3934174 Surge voltage protection for transfer switches for load-tap changers |
| 01/13/1976 | US3932791 Multi-range, high-speed A.C. over-current protection means including a static switch |
| 01/06/1976 | US3931618 Housing structure and magnetic biasing for bubble memories |