Patents for H01F 30 - Fixed transformers not covered by group (4,595)
01/1987
01/20/1987US4638177 Rotating flux transformer
12/1986
12/23/1986US4631511 Toroid transformers and secondary windings
12/23/1986US4631509 Electrical induction apparatus with support inside casing
12/23/1986US4631471 Inductor apparatus for application of ferroresonant regulators
11/1986
11/26/1986CN86103505A Method and an arrangement for controlling the magnetizing current passing through a transformer
11/11/1986US4622627 Switching electrical power supply utilizing miniature inductors integrally in a PCB
11/06/1986WO1986006543A1 Connector arrangement for electrical circuits in underwater installations, and transformer particularly for use in such arrangements
11/04/1986CA1213671A1 Electrical particle generator
10/1986
10/29/1986EP0199456A2 Electric transformer, possibly in combination with a rectifier
10/15/1986EP0197698A2 Inductance adjustment for transformers
10/08/1986CN86100489A Transient voltage protection for toroidal transformer
10/07/1986CA1212434A1 Air-core choke coil and method of manufacturing it
10/07/1986CA1212414A1 Method and apparatus for selective cancellation of subsynchronous resonance
10/01/1986EP0196004A2 Inductor apparatus for application to ferroresonant regulators
09/1986
09/24/1986CN86101882A Ignition coil assembly for internal combustion engines
09/24/1986CN86101693A Inductance adjustment for transformers
09/10/1986EP0096058B1 Electric transformer and method for making it
09/09/1986US4611190 Apparatus for transforming multiphase power of different phase to phase line levels into multiphase power having a single phase to phase voltage level
09/09/1986CA1211169A1 Distribution transformer with woundmagnetic circuit
09/02/1986CA1210828A1 Coil assembly with flux directing means
08/1986
08/13/1986EP0190930A2 Transient voltage protection for toroidal transformer
07/1986
07/29/1986CA1208723A1 Toroidal core electromagnetic device
07/29/1986CA1208696A1 Transformer with rectifier
07/15/1986US4599985 Ignition coil for multi-cylinder internal combustion engine
07/02/1986EP0186598A1 Three-phase electric-power supply for an ozone generator
07/02/1986EP0185750A1 Power transformer for use with very high speed integrated circuits
06/1986
06/17/1986US4595843 Low core loss rotating flux transformer
06/04/1986EP0126734B1 Ignition coal for ignition devices of internal combustion engines
05/1986
05/27/1986US4591819 Inductance adjustment for transformers
05/27/1986CA1205154A1 Neutral point plate of three-phase transformer for large secondary currents
05/20/1986US4590453 Autotransformer with common winding having oppositely wound sections
05/13/1986US4588971 Electric transformer with annular coil forms
05/06/1986US4587606 High voltage transformer and rectifier arrangement
05/06/1986US4587506 Safety transformer
04/1986
04/08/1986US4581598 Segmented toroidal air-core transformer
04/01/1986US4580122 Ignition coil for ignition systems of internal combustion engines
02/1986
02/18/1986US4571669 Transformer with rectifier
01/1986
01/08/1986EP0166952A1 High-current transformer with indirect adjustment of tension by an intermediate circuit
01/08/1986EP0166951A1 Transformer with a high-current bushing assembly
12/1985
12/19/1985WO1985005730A1 Power transformer for use with very high speed integrated circuits
12/04/1985EP0163167A1 Transformer device for electric welding
10/1985
10/30/1985EP0159387A1 Distribution transformer with coiled magnetic circuit
10/29/1985US4550364 Power transformer for use with very high speed integrated circuits
10/22/1985US4549130 Low leakage transformers for efficient line isolation in VHF switching power supplies
10/15/1985US4547721 Transformer structure
10/09/1985EP0157670A1 Transformer and method of producing it
09/1985
09/24/1985US4543552 Transformer, more especially a voltage dropping transformer for an electric welding machine
09/17/1985CA1193681A1 Transformers
09/11/1985EP0154052A1 Safety transformer
08/1985
08/27/1985US4538132 Impedance converting transformer formed of conductors extending through a magnetic housing
08/27/1985US4538131 Air-core choke coil
08/21/1985EP0151729A2 High-voltage transformer for X-Ray generator
08/20/1985US4536733 High frequency inverter transformer for power supplies
08/20/1985CA1192281A1 Toroidal electrical transformer and method of producing same
07/1985
07/10/1985EP0147544A2 High voltage transformer
06/1985
06/18/1985US4524342 Toroidal core electromagnetic device
06/11/1985CA1188765A1 Electrical transformer
04/1985
04/24/1985EP0137867A1 Fixing device for wound toroidal cores
04/23/1985US4513243 Core form transformer for selective cancellation of subsynchronous resonance
04/23/1985US4513240 Method and apparatus for selective cancellation of subsynchronous resonance
04/09/1985US4509495 Ignition coil for a multi-cylinder internal combustion engine
03/1985
03/26/1985US4507636 Neutral point plate of three-phase transformer for large secondary currents
03/26/1985CA1184621A1 Transformer, and method of manufacture
02/1985
02/19/1985US4500833 Switched mode power supply transformer
02/19/1985US4500829 Advance and retard phase-shift transformer
01/1985
01/29/1985US4496924 Pulse transformer having conductive shield around magnetic core material
01/29/1985US4496821 Transformer for robot arms
01/23/1985EP0131808A1 Very high frequency power transformer and method of manufacturing
01/15/1985US4494167 Inductor
01/08/1985US4493016 Rectifier transformer
12/1984
12/20/1984WO1984004993A1 Transformer for converting 3-phase ac into single-phase ac and 6-step dc
12/11/1984US4488136 Combination transformer with common core portions
12/05/1984EP0126734A1 Ignition coal for ignition devices of internal combustion engines.
12/04/1984US4486731 Coil assembly with flux directing means
11/1984
11/22/1984WO1984004625A1 Voltage-less ac transformer
11/13/1984US4482945 Transformer for low distortion rectifier system
11/06/1984CA1177546A1 Inductor and process of manufacturing the same
10/1984
10/30/1984CA1177127A1 Miniaturized transformer construction
10/16/1984US4477792 Modular power system reactor
09/1984
09/11/1984US4471337 Conductor bundles for the coils of dry inductors
09/05/1984EP0117515A1 Reactor having a plurality of coaxially disposed windings
09/04/1984US4470006 Transformer
07/1984
07/24/1984US4462017 High voltage air core reactor
07/10/1984US4459653 Apertured transformer and inverter using same
07/03/1984CA1170321A1 Low loss spider support for coil of an inductive apparatus
06/1984
06/07/1984WO1984002224A1 Ignition coal for ignition devices of internal combustion engines
05/1984
05/02/1984EP0106958A1 Electrodynamic pump
04/1984
04/03/1984US4441150 High-voltage rectifier unit
03/1984
03/15/1984WO1984001050A1 3-phase ac no-voltage transformer
01/1984
01/25/1984EP0099274A1 Transformer, particularly a tension reducer for electric welding equipment
01/25/1984EP0098897A2 Electrical generator utilizing magnetized particles
12/1983
12/21/1983EP0096058A1 Electric transformer and method for making it.
12/06/1983US4419606 Magnetron
10/1983
10/26/1983EP0092204A2 Inductance coil
10/26/1983EP0092018A1 Reactor, particularly air isolated reactor without magnetic core
10/11/1983CA1155174A1 Voltage regulator using saturable transformer
08/1983
08/09/1983US4398112 Aminated winding for electric machines
07/1983
07/27/1983EP0084412A1 Low loss spiders and air core reactor incorporating the same
07/13/1983EP0083567A1 Toroidal electrical transformer and method of producing same
07/06/1983EP0082954A1 Toroidal core electromagnetic device
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