Patents
Sitemap › H01 - Basic electric elements › H01F - Magnets; Inductances; Transformers; Selection of materials for their magnetic properties › H01F 38 - Adaptations of transformers or inductances for specific applications or functions
Patents for H01F 38 - Adaptations of transformers or inductances for specific applications or functions (13,550)
12/1981
12/16/1981EP0041917A2 Inductive-voltage transformer for a fully insulated, metal-enclosed high-voltage switchgear
12/09/1981EP0041469A1 Inductive voltage transformer
12/08/1981US4305056 Transformer with gapped core
12/01/1981US4303902 Inductive coupler
11/1981
11/17/1981US4301491 Combined fault current and applied voltage tripping for solid state trip circuit and particular current transformer construction
11/17/1981US4300519 Ignition coil device attaching construction
11/17/1981CA1112752A1 Oil burner ignition and control package
11/11/1981EP0039485A1 Line transformer for a television receiver
10/1981
10/27/1981US4297665 Doughnut-type transformer for resistance butt welding
10/21/1981EP0038284A1 Inductive voltage transformer, with gas or fluid insulation
10/21/1981EP0037970A2 Line transformer for a television receiver
10/14/1981EP0037796A1 Current transformer having fluid insulant
10/13/1981US4295112 Residual current transformer
10/07/1981EP0037367A1 Gas or liquid insulated measuring transformer
10/07/1981EP0037366A1 Current transformer with gas or fluid insulation
10/06/1981US4293903 High voltage rectifier for television receiver sets
10/06/1981CA1110336A1 Current transformer
09/1981
09/17/1981WO1981002648A1 Low-loss reactor
09/08/1981US4288773 Amorphous metal ballasts and reactors
09/02/1981EP0034955A1 Ignition coil for internal-combustion engines
09/01/1981US4287545 Differential transformer
08/1981
08/20/1981WO1981002363A1 A device for indicating an alternating current in a conductor
08/18/1981CA1107425A1 Porous encapsulating composition for electrical apparatus
08/18/1981CA1107359A1 Transformer with a liquid cooled case and a method for making the liquid cooled case
08/18/1981CA1107358A1 Encapsulated current transformer
08/18/1981CA1107349A1 Protective circuit for a switching regulator
08/18/1981CA1107348A1 Breakerless magneto device
08/12/1981EP0033450A1 Line output transformer for television receiver
07/1981
07/28/1981US4281214 Ignition coil cover
07/07/1981CA1104650A1 Capacitive voltage transformer with improved compensating reactor arrangement
06/1981
06/24/1981EP0030737A1 Ballast for gaseous discharge lamps
06/16/1981US4273051 Electric device
06/10/1981EP0030191A1 D.C. power supply generator and television receiver comprising such a generator
06/10/1981EP0030041A1 Measuring transformer, especially for measuring a magnetic field generated by a measuring current
06/10/1981EP0029903A1 Measuring arrangement for electric currents
06/02/1981US4271463 High voltage transformer
05/1981
05/26/1981US4270110 Bus bar adaptor for window type current transformers
05/13/1981EP0028383A1 Line output transformer for television receiver
05/12/1981CA1101086A1 Induction voltage transformer
05/05/1981US4266269 Fly-back transformer
05/05/1981US4266189 Current measuring apparatus and method
04/1981
04/21/1981US4262672 Acupuncture instrument
04/14/1981US4262272 Ignition coil
04/14/1981US4262209 Supplemental electrical power generating system
04/08/1981EP0026375A1 Transformer producing the high tension for an ignition spark
03/1981
03/24/1981US4258348 Current measuring transformer
03/17/1981US4257080 Current limiting devices
03/11/1981EP0024522A2 Inverter for operating at least two gas discharge lamps
02/1981
02/03/1981US4249153 Ring transformer for resistance butt welders
02/03/1981US4248201 Molded ignition device
01/1981
01/27/1981US4247889 High-voltage-secondary transformer, particularly television line transformer
01/20/1981US4246636 Flyback transformer having terminal pins for connection to printed circuit boards
01/20/1981US4245594 Ignition device
01/20/1981CA1094161A1 Shrouded jaws for hook-on type instrument
01/13/1981US4245177 Inverter for operating a gaseous discharge lamp
01/06/1981US4243623 Method of encapsulating electrical apparatus
12/1980
12/16/1980US4240057 Inductive element construction, particularly fluorescent lamp ballast
12/16/1980US4240031 Device for measuring the potential of an alternating current carrying inner conductor of an encased high-voltage switching mechanism
12/10/1980EP0020009A1 Ignition coil with excess-pressure releasing arrangement
12/09/1980US4238753 Transformer core gapping and lead anchoring arrangement
12/09/1980CA1091315A1 Transformer
11/1980
11/25/1980US4236200 Semiconductor circuit having a series-connected reactor
11/25/1980US4236086 Apparatus for the detection and processing of electric signals
11/18/1980US4234863 Inductive pickup clip
11/12/1980EP0018921A1 Device for electric transmission by a system of separable and contactless connections
11/11/1980US4232922 Signal power coupling to rotary shaft
11/04/1980US4232284 Ignition coil and electrical connector therefor
11/04/1980US4231150 Method of tuning a flyback transformer for minimum ringing
10/1980
10/29/1980EP0018309A1 Current transformer
10/29/1980EP0017885A1 Corona-effect loudspeaker
10/21/1980US4229787 Flyback transformer
10/21/1980US4229786 Fly-back transformer with a low ringing ratio
10/21/1980US4229721 Welding transformer with drooping voltage-current characteristics
10/15/1980EP0017099A1 Static magnetic frequency multiplier
10/07/1980US4227143 High-voltage transformer
09/1980
09/09/1980US4222089 Oil burner ignition and control package
08/1980
08/19/1980CA1084129A1 Rotary transformer with unique physical and electrical characteristics
07/1980
07/22/1980US4214199 Current transformer
07/15/1980US4213076 Constant-current transformer for gas-discharge tubes
07/15/1980US4212256 Detachable sole plate
07/01/1980US4210947 Protective circuit for a switching regulator
06/1980
06/25/1980EP0012629A1 Electrical reactors
06/24/1980US4209763 Induction voltage transformer
06/17/1980US4208616 Inductive stabilization ballast for a discharge lamp
05/1980
05/28/1980EP0011590A1 Fully isolated metal-encapsulated high voltage switchgear with unipolar current transformers
05/20/1980US4204263 Flyback transformer
05/20/1980US4203404 Distributorless ignition method and system for a multicylinder internal combustion engine
05/20/1980CA1078012A1 Subharmonic frequency generator
05/13/1980US4203085 Induction coil core
05/13/1980CA1077584A1 Magnetically coupled coils with intervening conductive ring
05/06/1980CA1077100A1 Disconnect contact assembly for metal-clad switchgear and the like
04/1980
04/29/1980US4200853 Transformer with single turn U-shaped winding
04/29/1980CA1076666A1 Top core type current transformer structure
04/22/1980US4199743 Encapsulated current transformer
04/16/1980EP0009542A1 Magnet coil for welding with magnetically moved arc
04/01/1980US4195611 Consolidated ignition transformer and circuit assembly for an internal combustion engine ignition system
03/1980
03/25/1980US4194482 Self generating ignition system
03/18/1980CA1073963A1 Integrally ballasted electrodeless fluorescent lamp
02/1980
02/05/1980US4187450 High frequency ballast transformer
01/1980
01/08/1980CA1069586A1 Transducer for the measurement of polyphase current independently of frequency
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