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Class Information
Number: 336/181
Name: Inductor devices > Winding formed of plural coils (series or parallel) > Wound to reduce external magnetic field (i.e., fieldless winding)
Description: Subject matter in which the coils of the winding are so positioned, constructed and connected that the resultant external magnetic field set up, when current is caused to flow in each of the coils, is substantially reduced or cancelled (i.e., so-called "fieldless" coils).

Patents under this class:
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Patent Number Title Of Patent Date Issued
8143977 Electromagnetic drive and an electromechanical switching device Mar. 27, 2012
8102235 Coreless printed-circuit-board (PCB) transformers and operating techniques therefor Jan. 24, 2012
7969269 Pick-up apparatus for inductive power transfer systems Jun. 28, 2011
7880575 Coil bus for a transformer Feb. 1, 2011
7839251 Filtering choke arrangement for a frequency converter Nov. 23, 2010
7839255 Composite transformer and power converter using same Nov. 23, 2010
7752735 Coil bus transformer and a method of manufacturing the same Jul. 13, 2010
7394340 Electromagnetic device, high-voltage generating device, and method for making the electromagnetic device Jul. 1, 2008
7382221 Coil Jun. 3, 2008
7276999 Method and apparatus for substantially reducing electrical earth displacement current flow generated by wound components Oct. 2, 2007
7236078 Method and apparatus for substantially reducing electrical earth displacement current flow generated by wound components Jun. 26, 2007
7233223 Transformer winding Jun. 19, 2007
7164338 Method and apparatus for substantially reducing electrical earth displacement current flow generated by wound components Jan. 16, 2007
7148779 Pulse type transformer with increased coupling coefficient through configuration of plural primary windings Dec. 12, 2006
7142085 Insulation and integrated heat sink for high frequency, low output voltage toroidal inductors and transformers Nov. 28, 2006
6924724 Method and apparatus for transformer bandwidth enhancement Aug. 2, 2005
6917271 Cross current control for power converter systems and integrated magnetic choke assembly Jul. 12, 2005
6816053 Circuit to mitigate transformer shorted turn Nov. 9, 2004
6583702 Quadrupole mass spectrometer driver with higher signal levels Jun. 24, 2003
6456182 Common mode choke coil Sep. 24, 2002
6417753 Planar magnetic device without center core leg Jul. 9, 2002
6362012 Structure of merged vertical capacitor inside spiral conductor for RF and mixed-signal applications Mar. 26, 2002
6351202 Stationary induction apparatus Feb. 26, 2002
6236297 Combinational inductor May. 22, 2001
6146526 Variable resonance descaling decalcifier device connected to a forced sequential rephasing transformer Nov. 14, 2000
6121696 EMI preventive AC line filter Sep. 19, 2000
6100781 High leakage inductance transformer Aug. 8, 2000
6084354 Vehicle-lamp lighting-on device Jul. 4, 2000
5877667 On-chip transformers Mar. 2, 1999
5770982 Self isolating high frequency saturable reactor Jun. 23, 1998
5751205 High-voltage transformer for a television receiver May. 12, 1998
5731666 Integrated-magnetic filter having a lossy shunt Mar. 24, 1998
5702600 Variable resonance descaling decalcifier device connected to a forced sequential rephasing transformer Dec. 30, 1997
5581224 Choke coil for eliminating common mode noise and differential mode noise Dec. 3, 1996
5579202 Transformer device Nov. 26, 1996
5565835 Substantial nullification of external magnetic fields and lorentz forces regarding toroidal inductors Oct. 15, 1996
5565836 Nullification of magnetic fields relative to coils Oct. 15, 1996
5525951 Choke coil Jun. 11, 1996
5473299 Horizontal linearity correction coil Dec. 5, 1995
5473301 Energy storage inductor apparatus Dec. 5, 1995
5422619 Common mode choke coil Jun. 6, 1995
5319343 Integrated magnetic inductor having series and common mode windings Jun. 7, 1994
5304850 Power line carrier frequency breaker Apr. 19, 1994
5270656 Biplanar RF coils for magnetic resonance imaging or spectroscopy Dec. 14, 1993
5023585 Common-mode choking coil Jun. 11, 1991
5003277 Phase-shifting transformer with a six-phase core Mar. 26, 1991
4973930 Twin coil Nov. 27, 1990
4894610 Current-transformer arrangement for an electrostatic meter Jan. 16, 1990
4763093 High-power pulse transformer for short high-voltage and/or high-current pulses Aug. 9, 1988
4746891 High saturation three coil current transformer May. 24, 1988

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