Patents
Sitemap › H01 - Basic electric elements › H01F - Magnets; Inductances; Transformers; Selection of materials for their magnetic properties › H01F 29 - Variable transformers or inductances not covered by group
Patents for H01F 29 - Variable transformers or inductances not covered by group (3,889)
05/1984
05/23/1984EP0109096A1 Variable inductance device
05/01/1984US4446343 Switch mechanism for transformer
04/1984
04/25/1984EP0106371A2 Variable inductance for a three-phase circuit
04/24/1984US4445082 Variable ratio transformer and static balance compensator
03/1984
03/21/1984EP0103299A1 Cylindrical oil vessel for stepping switches of transformer tap changers
03/21/1984EP0103298A1 Cylindrical oil vessel for stepping switches of top-changers
02/1984
02/14/1984US4431960 Current amplifying apparatus
01/1984
01/04/1984EP0097367A1 Split structure type transformer
12/1983
12/21/1983EP0096058A1 Electric transformer and method for making it.
12/06/1983US4419648 Current controlled variable reactor
12/06/1983US4419619 Microprocessor controlled voltage regulating transformer
11/1983
11/30/1983EP0095398A1 Electric transformer with modular, selectively fed primary circuits
11/15/1983US4415873 Variable inductor having reduced arcing tendency
11/15/1983CA1157091A1 Variable voltage direct current power supply and motor speed control
10/1983
10/25/1983US4412200 Variable inductor with carriage for multiple trolley wheels
10/25/1983US4412199 Regulating winding connected in series with a main winding of a transformer
10/11/1983US4409523 Pincushion distortion correction apparatus
10/11/1983CA1155174A1 Voltage regulator using saturable transformer
09/1983
09/14/1983EP0088296A1 Contact arrangement for tap-changers of regulating transformers
07/1983
07/19/1983US4394636 Structure of a transformer
07/12/1983US4393157 Variable inductor
07/05/1983CA1149431A2 Rotary switch
06/1983
06/23/1983WO1983002194A1 Electric transformer and method for making it
05/1983
05/31/1983US4386333 Universal electrical connection apparatus
05/31/1983CA1147407A1 Variable transformer method and apparatus
05/18/1983EP0078908A2 Regulation transformer
05/17/1983US4384247 Under-load switching device particularly adapted for voltage regulation and balance
05/17/1983CA1146343A1 Apparatus for punching and winding of motor and transformer cores
05/11/1983EP0078386A1 Voltage transformers
04/1983
04/20/1983EP0077240A1 Printed tape inductance and transmitter using such an inductance
03/1983
03/22/1983CA1143435A1 High voltage transformer for ac-dc converter
02/1983
02/22/1983CA1141819A1 Variable phase-shifting transformer network
02/16/1983EP0072266A1 Method of obtaining a coil with a closed magnetic circuit and a permanent magnet for the ignition of combustion engines
02/09/1983EP0071008A1 Line transformer, in particular a transformer for a television receiver
01/1983
01/12/1983EP0069284A1 Arrangement for windings of double floor transformers
01/05/1983EP0069006A1 Transformer with movable secondary winding, especially for welding
12/1982
12/07/1982US4363060 Arcless tap changer for voltage regulator
12/01/1982EP0065684A1 Line-deflection circuit for a television receiver
11/1982
11/23/1982CA1136239A1 Sine cosine linear variable phase transformer
10/1982
10/26/1982US4356359 Electrical apparatus comprising a series of current taps and variable switching gear
09/1982
09/29/1982EP0061076A1 Fine-adjusting windings for a transformer or an inductance
09/07/1982CA1131313A1 Magnetic modulator differentially outputting magnetic core noise
08/1982
08/31/1982US4347489 Variable three-phase inductor
08/10/1982US4344126 Low ripple D.C. power supply
08/10/1982CA1129586A1 Aromatic polyester resins containing p.p' thiodiphenol
08/10/1982CA1129497A1 Three phase power control unit
08/03/1982CA1129058A1 Transformer with offset side wall-mounted on-load tap changer
07/1982
07/27/1982US4342075 Switched mode DC to DC converter using variable leakage transformer
07/13/1982US4339792 Voltage regulator using saturable transformer
07/13/1982CA1127726A1 Regulating winding structure for transformer
06/1982
06/22/1982CA1126357A1 Variable ratio transformer and static compensator
06/16/1982EP0053686A1 Reactance with plunger-type magnetic core
06/01/1982CA1124790A1 Tap-changing switching device including vacuum switches
05/1982
05/25/1982CA1124316A1 Current limiting devices
05/19/1982EP0052091A1 Protection arrangement against excess arc-currents
05/18/1982US4330818 Variable voltage direct current power supply and motor speed control
05/11/1982US4329674 High voltage transformer for AC-DC converter
05/04/1982US4328458 Variable leakage transformer and control circuit therefore
04/1982
04/28/1982EP0050432A1 Transformer
04/27/1982US4327348 Variable leakage transformer
04/13/1982US4325020 Regulating transformer
03/1982
03/16/1982CA1120112A1 Tap changing transformer
03/09/1982US4319183 Control windings for self-saturating electrical reactors
02/1982
02/24/1982EP0046310A1 Axial air gap motor
02/23/1982CA1118826A1 Change-over switch for tap-changing regulating transformers
02/16/1982CA1118509A1 Inductance variable
01/1982
01/05/1982US4309651 Wide range voltage regulator circuit
12/1981
12/15/1981CA1114465A1 Tapped air core reactor
11/1981
11/17/1981US4301489 Arcless tap changer utilizing static switching
09/1981
09/16/1981EP0035637A1 Tap changer with potential switch for tapped transformers
09/02/1981EP0034955A1 Ignition coil for internal-combustion engines
09/01/1981CA1108253A1 Adjustable transformer
08/1981
08/04/1981US4282485 Linear variable phase transformer with constant magnitude output
07/1981
07/07/1981US4277770 Regulating winding structure for transformer
06/1981
06/09/1981US4272724 Magnetic modulator for magnetic field detection differentially outputting magnetic core noise
06/03/1981EP0029467A1 Electrical apparatus comprising a series of voltage taps and mobile selector equipment
04/1981
04/01/1981EP0026158A1 Transformer with variable ratio and static compensator with flipflop
03/1981
03/17/1981US4257080 Current limiting devices
03/17/1981US4256932 Rotary switch
03/10/1981US4255734 Transformer with tapped subwindings
02/1981
02/10/1981CA1095601A1 Regulating transformer with magnetic shunt
01/1981
01/27/1981US4247841 Three winding transformer
01/13/1981US4245177 Inverter for operating a gaseous discharge lamp
12/1980
12/30/1980CA1092693A1 Three - phase tap-changing switching device
11/1980
11/25/1980US4236108 Variable phase-shifting transformer network
11/25/1980CA1090419A1 Fail-safe circuit for tap-changing transformer regulating system
11/18/1980US4234864 Transformer with offset side wall-mounted on-load tap changer
10/1980
10/21/1980US4229721 Welding transformer with drooping voltage-current characteristics
10/15/1980EP0017019A1 Transformer or inductance coil with a coil with tappings
09/1980
09/03/1980EP0014988A1 Contact device for the tap changer of a tap transformer
09/02/1980US4220911 Thyristor tap changer for electrical inductive apparatus
08/1980
08/26/1980US4219759 Three phase power control unit
08/26/1980US4219629 P-Oxybenzoyl copolyesters comprising thiodiphenol components and having improved flexibility and solubility in organic solvents
07/1980
07/15/1980US4213084 Variable leakage transformer
07/15/1980CA1081783A1 On-load tap changer
07/01/1980US4210859 Inductive device having orthogonal windings
06/1980
06/10/1980US4207445 On-load tap changer switch assembly
06/03/1980US4206434 Regulating transformer with magnetic shunt
06/03/1980US4206433 Universal impedance power apparatus
05/1980
05/14/1980EP0010685A1 Punch and winding machine
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