Patents
Sitemap › H01 - Basic electric elements › H01F - Magnets; Inductances; Transformers; Selection of materials for their magnetic properties › H01F 27 - Details of transformers or inductances, in general
Patents for H01F 27 - Details of transformers or inductances, in general (43,362)
11/1989
11/15/1989CN1037231A Low-frequency transformer
11/14/1989US4880944 Bar for induction devices
11/14/1989US4879804 Method of fabricating a coil
11/09/1989DE3912874A1 Trockentransformator mit ummantelten wicklungen, leiter sowie analoge elektrische installationen und verfahren zur herstellung des harzes fuer die ummantelung Dry-type transformer windings coated, conductor and analog electrical installations and process for manufacture of resin for the wrapping
11/07/1989US4879004 Process for the extraction of oil or polychlorinated biphenyl from electrical parts through the use of solvents and for distillation of the solvents
11/07/1989US4878291 Method of manufacturing toroidal coils
11/07/1989CA1262606A1 Method for replacing pcb-containing coolants in electrical induction apparatus with substantially pcb-free dielectric coolants
11/02/1989WO1989010622A1 Improved capacitor with controlled impedance
11/02/1989WO1989010621A1 Matrix transformer having high dielectric isolation
11/02/1989EP0340083A1 Ignition coil for internal combustion engines of automobile vehicles and process of fabrication
11/02/1989EP0339934A2 Winding for an electrical induction device
11/02/1989EP0339827A1 Flat voltage transformer
11/02/1989EP0339384A1 Transformer core
11/02/1989EP0339215A1 Stacked lamination magnetic cores
11/02/1989DE3813919A1 Component for use for electrotechnical purposes
11/02/1989DE3812998A1 Housing for accommodating medium-voltage or high-voltage fuses and arrangement of the latter in the former
10/1989
10/31/1989US4877567 Method for manufacturing an electrically insulating formed channel member
10/26/1989DE3813118A1 Coil former
10/25/1989EP0338476A1 Method for improving the fire resistance of a dry-type transformer winding
10/25/1989EP0338421A1 Safety switch
10/25/1989CN2046678U Triphase arc welding transformer
10/25/1989CN2046676U Primary winding of a.c. high-voltage current transformer
10/24/1989US4875277 Formed metal core blocking method
10/19/1989WO1989009994A1 Saturable inductor and transformer structures for magnetic pulse compression
10/18/1989EP0337716A2 Magnetic ribbon and magnetic core
10/18/1989EP0337191A1 Line transformer
10/18/1989CN2046266U Transformer of energy-saving neon lamp
10/17/1989US4874990 Notch gap transformer and lighting system incorporating same
10/17/1989US4874977 Stator assembly having coil bobbins with retaining clips
10/11/1989EP0336771A2 Integrated capacitor and inductors/transformers utilising insulated amorphous metal ribbon
10/11/1989EP0336053A2 Method and devices for isolating high-voltage metallic parts
10/11/1989EP0335904A1 Multi-phase electronic temperature controller.
10/11/1989CN2045887U Pouring dry transformer
10/11/1989CN1036290A Ac power amplifier
10/11/1989CN1036289A Modular high frequency power transformer
10/10/1989US4873505 Electric noise absorber
10/05/1989WO1989009476A1 Immersion-type electrical apparatus with increased fire protection
10/04/1989EP0335713A1 Ferrite toroid isolator
10/04/1989EP0335351A1 Method for monitoring unusual signs in gas-charged apparatus and gas-charged apparatus including unusual sign monitor
10/04/1989CN1036102A Small transformer
10/03/1989US4870729 Method of making a noise filter
09/1989
09/28/1989DE3908896A1 Chip inductor
09/27/1989EP0334520A1 Integrated inductor/capacitor device using soft ferrites
09/26/1989US4869765 Production process of bobbin for voice coil
09/26/1989CA1260089A1 Low profile magnetic structure in which one winding acts as support for second winding
09/26/1989CA1260088A1 High-power pulse transformer for short high-voltage and/or high-current pulses
09/26/1989CA1260086A1 Ac current sensor and method of making same
09/21/1989DE3807892A1 SMD radio-frequency transformer for wave soldering
09/19/1989US4868534 Coil assembly with fixedly located wire connectors
09/19/1989US4868533 Transformer with a one-piece primary winding and housing
09/19/1989US4868532 Transformer with a two-piece primary winding and housing
09/19/1989CA1259461A1 Method for replacing pcb-containing coolants in electrical induction apparatus with substantially pcb-free dielectric coolants
09/14/1989DE3906368A1 Method for producing a stator magnetic circuit of rotating electrical machines or a magnetic circuit of transformers, and a magnetic circuit thus obtained
09/12/1989US4866409 Resin-crack prevented high-voltage transformer
09/06/1989EP0331008A1 Electromagnetic induction apparatus with a sound suppressing arrangement
09/06/1989EP0330658A1 Heat convertor for an x ray generator
09/05/1989US4864486 Plank and frame transformer
09/05/1989US4864267 Stationary induction apparatus with core indentations and ridges
09/05/1989US4864266 High-voltage winding for core-form power transformers
09/05/1989US4864265 Transient suppressing power transformer
09/05/1989US4862956 Apparatus and method for cooling the core of a liquid cooled transformer
08/1989
08/31/1989DE3805255A1 Package for annular electrical construction elements
08/29/1989US4862130 Wire cross-over arrangement for angular coil assembly
08/29/1989US4862129 Single-turn primary and single-turn secondary flat voltage transformer
08/29/1989US4860433 Method of manufacturing an inductance element
08/23/1989CN2043413U Radiator for transformer
08/23/1989CN1035019A Concentric bell-mouthed coil
08/22/1989US4859978 High-voltage windings for shell-form power transformers
08/22/1989US4859977 Insulator device for power transformer
08/22/1989CA1258699A1 Preformed multiple turn transformer winding
08/22/1989CA1258698A1 Transformer and ferrite core assembly therefor
08/17/1989DE3903587A1 Koaxialer induktiver verbinder Coaxial connectors inductive
08/16/1989EP0327860A1 Electrical component of the chip type, and method of making the same
08/16/1989CN2043000U New construction coil without internal stay
08/16/1989CN2042999U High pressure overhead coil
08/15/1989US4858076 Converter
08/15/1989US4857878 Modular high frequency power transformer
08/15/1989US4857877 Transformer having coaxial coils
08/15/1989US4857876 Shunt latch
08/10/1989WO1989007324A1 Gasket assembly and electrical power transformer including the same
08/08/1989US4855891 Power supply design
08/03/1989DE3900286A1 Transformer
08/02/1989EP0326430A1 Static induction electric apparatus
08/02/1989EP0325812A1 Capacitor having current surge protection
08/01/1989US4853668 Integrated magnetic converter core
08/01/1989US4853667 Wire robbin for inductive devices
08/01/1989US4853665 Noise suppressing isolation transformer
08/01/1989US4853659 Planar pi-network filter assembly having capacitors formed on opposing surfaces of an inductive member
08/01/1989US4853292 Stacked lamination magnetic cores
07/1989
07/27/1989WO1989006860A1 Transformer
07/26/1989EP0325467A1 Modular high frequency power transformer
07/26/1989EP0325322A1 Coil bobbin for a high-voltage transformer
07/26/1989CN2041852U Combination insulating transformer type high-pressure producer
07/25/1989US4851803 Split core insulator and locking device
07/18/1989US4848684 Wound core having circular and elliptic outer surface portions
07/18/1989US4847986 Method of making square toroid transformer for hybrid integrated circuit
07/18/1989US4847984 Method of assembling a flexible circuit magnetic core winding onto a core member
07/12/1989CN2041067U Regulated transformer for electronic ballast
07/12/1989CN2041065U Electrical plywood with low dielectric constant
07/11/1989US4847730 Composite-type circuit component and its manufacturing method
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