Patents for H01F 21 - Variable inductances or transformers of the signal type (1,432)
06/2001
06/20/2001CN1300088A Mfg. method and apparatus for laminated electronic element
06/07/2001WO2001041165A1 Process for variable inductor using nickel titanium and placement
06/06/2001CN2433716Y 电感器 Inductor
05/2001
05/08/2001US6229424 Variable linearity coil
04/2001
04/18/2001CN1291779A Variable inductor element
02/2001
02/28/2001EP1079458A2 Variable inductance element
02/14/2001EP1076345A2 Variable inductance element
02/06/2001US6184755 Article comprising a variable inductor
01/2001
01/17/2001EP1069576A1 Article comprising a variable inductor
01/17/2001EP1068631A1 Use of variable impedance having rotating core to control coil sputter distribution
12/2000
12/19/2000US6163238 Fast variable RF network inductor
12/12/2000US6159817 Multi-tap thin film inductor
11/2000
11/09/2000WO2000066970A1 Electronic transducer for measuring flexion
09/2000
09/05/2000US6114938 Variable inductor device
09/05/2000US6114934 Variable linearity coil
06/2000
06/06/2000US6072992 High-frequency device
05/2000
05/30/2000CA2198488C Printed circuit board inductor
05/09/2000US6060972 Method and means for replacing an electrically conducting cable by another electrically conducting cable
04/2000
04/18/2000US6052571 Tuner for PSK or PAM data applications
01/2000
01/26/2000CN2360914Y Choke transformer
12/1999
12/28/1999US6008456 Load switch for a step switch
12/21/1999US6005467 Trimmable inductor
10/1999
10/07/1999WO1999050884A1 Use of variable impedance having rotating core to control coil sputter distribution
09/1999
09/14/1999US5952896 Impedance matching network
09/14/1999CA2184731C An electrically controllable inductor
09/01/1999EP0939426A1 Magnetic core and deflection yoke having the same
08/1999
08/17/1999US5939965 Inductive component with variable magnetic performance
06/1999
06/29/1999US5917386 Printed circuit transformer hybrids for RF mixers
06/23/1999CN1220542A Variable linearity coil
06/22/1999US5914697 Method of fabricating radio device helical antennas
06/09/1999CN1218965A Changeable linear coil
05/1999
05/26/1999CN1217552A Variable inducer
05/19/1999EP0917162A2 Variable inductor device
04/1999
04/07/1999CN1213146A Adjustable saturable transformer
02/1999
02/09/1999US5870328 Bistable magnetic element and method of manufacturing the same
12/1998
12/02/1998EP0881647A1 Transformer with controlled interwinding coupling and controlled leakage inductances and circuit using such transformer
11/1998
11/25/1998CN1199910A Printed circuit transformer hybrids for mixers
11/03/1998US5831432 Differential magneto-impedance magnetic field sensor
10/1998
10/07/1998EP0868734A1 Load switch for a step switch
10/06/1998US5815918 Method for replacing an electrically conducting cable by another electrically conducting cable
09/1998
09/24/1998DE19810617A1 High frequency transformer hybrid for HF mixer in printed circuit, etc.
08/1998
08/19/1998EP0782754A4 Printed circuit board inductor
08/13/1998WO1998035366A1 Trimmable inductor
07/1998
07/15/1998EP0853380A2 High efficiency impedance matching network
06/1998
06/23/1998US5770982 Self isolating high frequency saturable reactor
06/17/1998EP0748471A4 An electrically controllable inductor
05/1998
05/19/1998US5754034 Electrically controllable inductor
05/14/1998DE19646774A1 High frequency circuit equalisation method for television tuner
03/1998
03/25/1998EP0831549A1 Helical antenna and process for producing the same
02/1998
02/25/1998EP0825712A2 Electronically tuned matching networks using adjustable inductance elements and resonant tank circuits
02/17/1998US5719544 Transformer with controlled interwinding coupling and controlled leakage inducances and circuit using such transformer
01/1998
01/06/1998US5705972 Substrate for an induction sensor
12/1997
12/23/1997US5701114 Rotary variable differential transformers
12/10/1997EP0812066A1 High-frequency device
11/1997
11/04/1997US5684678 Resonant converter with controlled inductor
10/1997
10/09/1997WO1997037400A1 Helical antenna and process for producing the same
10/08/1997EP0800185A1 Apparatus comprising at least one controllable inductance
09/1997
09/25/1997DE19611492A1 Determining position of turns and tuning gap between turns in air core coil
09/24/1997EP0797223A1 Inductive component with tunable magnetic behaviour
09/18/1997CA2200172A1 Inductive component with variable magnetic performance
07/1997
07/30/1997CN2258650Y Stepless changeable electric reactor
07/09/1997EP0782754A1 Printed circuit board inductor
07/03/1997WO1997023953A1 High-frequency device
07/03/1997WO1997023888A1 Load switch for a step switch
07/03/1997CA2241136A1 Load switch for a step switch
07/02/1997CN2257396Y Short-circuit type adjustable inducer
06/1997
06/11/1997EP0778659A2 Resonant converter with controlled inductor
06/05/1997WO1997020328A1 Controlled by-pass reactor
06/04/1997CN2255657Y Signal receiving coil for small closed locomotive
05/1997
05/14/1997EP0773449A2 Magnetic field sensor
05/13/1997US5629553 Variable inductance element using an inductor conductor
05/07/1997DE19547873C1 Load changeover device for stage-transformer step switch
04/1997
04/03/1997DE19536267A1 Adjustable inductive electric component esp. SIMID choke
04/02/1997EP0766440A1 Method and means for replacing an electrically conducting cable by another electrically conducting cable
03/1997
03/25/1997US5615091 Isolation power supply
03/19/1997EP0763832A1 Bistable magnetic element and method of manufacturing the same
03/13/1997DE19533050A1 Mfg. an inductive component having at least one coil e.g. for filters or oscillatory circuits
12/1996
12/18/1996EP0748471A1 An electrically controllable inductor
11/1996
11/12/1996US5574410 Impedance matching network
11/12/1996US5572788 Coil device
11/05/1996US5572170 Electronically tuned matching networks using adjustable inductance elements and resonant tank circuits
10/1996
10/30/1996CN2239068Y Power switch transformer for broadcast sending machine
10/10/1996DE19523352C1 Current monitoring device e.g. for electric conductor in on-load tap-switch
09/1996
09/12/1996WO1996027891A1 Variable resistor, inductor or capacitor
08/1996
08/29/1996DE19516934C1 Inductive proximity switch with oscillator coil
08/13/1996US5546065 High frequency circuit having a transformer with controlled interwinding coupling and controlled leakage inductances
08/07/1996CN1128394A Transformer winding components with optimized distributed parameters
07/1996
07/16/1996US5537088 Structure of an induction sensor
07/09/1996US5534837 Orthogonal-field electrically variable magnetic device
06/1996
06/12/1996EP0716432A1 Planar inductor
06/05/1996EP0715323A1 Setting inductance value of magnetic components
06/04/1996US5523673 Electrically controllable inductor
04/1996
04/02/1996US5504427 Rotational position sensor having variable coupling transformer
03/1996
03/07/1996WO1996007187A1 Printed circuit board inductor
12/1995
12/12/1995US5475347 Compact AC noise filter with ground inductor
10/1995
10/24/1995US5461353 Printed circuit board inductor
09/1995
09/20/1995CN2208266Y Screwed conductive rod for transformer
09/08/1995WO1995024005A1 An electrically controllable inductor
09/07/1995DE4406417A1 Inductive appts. for measurement of travel or angular movement
08/1995
08/16/1995EP0667052A1 Contactless battery charging system
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