| Patents for H01F 19 - Fixed transformers or mutual inductances of the signal type (1,296) |
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| 05/29/2001 | US6239668 RF balun and transformer with shunt compensation transmission line |
| 05/22/2001 | US6233834 Miniature transformers for millimachined instruments |
| 04/19/2001 | WO2001027946A1 Interface module for a local data network |
| 04/19/2001 | DE19948897A1 Schnittstellenmodule für lokale Datennetzwerke Interface modules for local data networks |
| 04/17/2001 | US6217790 BALUN transformer core material, BALUN transformer core and BALUN transformer |
| 04/12/2001 | DE19944741A1 Monolitisch integrierter Transformator Monolithic integrated transformer |
| 04/11/2001 | EP1091369A2 Low profile transformer and method for making a low profile transformer |
| 04/04/2001 | EP1038350A4 Apparatus and methods for enhancing electronic audio signals |
| 04/04/2001 | EP0929948B1 Wireless energy and data transfer for a modular peripheral system |
| 04/03/2001 | US6211766 High voltage transformer |
| 03/29/2001 | WO2001022444A1 Monolithic integrated transformer |
| 03/14/2001 | EP1082737A1 Safety isolating transformer |
| 03/07/2001 | EP1081873A1 Asymmetric transformer for a telephone line |
| 03/07/2001 | CN1286353A Mutually inductive trigger |
| 02/27/2001 | US6194684 Output choke for D.C. welder and method of using same |
| 02/20/2001 | US6191396 Heater abnormality detecting circuit |
| 02/14/2001 | CN1284214A Appts and methods for enhancing electronic audio signals |
| 02/13/2001 | US6188305 Transformer formed in conjunction with printed circuit board |
| 02/13/2001 | CA2237819C A micromagnetic device for power processing applications and method of manufacture therefor |
| 01/31/2001 | EP0880823A4 High impedance ratio wideband transformer circuit |
| 01/31/2001 | CN1282081A Step-up transformer for high freguency heater |
| 01/30/2001 | US6181232 Coil element |
| 01/24/2001 | CN2416579Y Lmproved structure of small size transformer |
| 12/20/2000 | EP1061768A2 Transformer, loudspeaker device and loudspeaker system |
| 12/19/2000 | US6163234 Micromagnetic device for data transmission applications and method of manufacture therefor |
| 12/12/2000 | US6160721 Micromagnetic device for power processing applications and method of manufacture therefor |
| 12/06/2000 | EP1058279A1 Boosting transformer for high-frequency heating device |
| 11/22/2000 | CN1274164A Line interface transformer |
| 10/19/2000 | WO2000062420A1 Rf transformer with compensation transmission line |
| 10/12/2000 | DE19915649A1 Impedanz-Transformator für einen Gegentakt-Verstärker eines Kurz- oder Ultrakurzwellen-Senders Impedance transformer for a push-pull amplifier of a short or ultra-short wave transmitter |
| 10/11/2000 | EP1043736A1 Transformer assembly for push-pull amplifier of short or ultrashort wave transmitter |
| 10/04/2000 | CN2399816Y High frequency large current transformer |
| 09/27/2000 | EP1038350A1 Apparatus and methods for enhancing electronic audio signals |
| 09/20/2000 | EP1037300A1 Radio frequency transformer and its use |
| 09/20/2000 | EP1037221A2 Coil device and switching power supply apparatus using the same |
| 09/19/2000 | US6121765 Isolated electrical power supply |
| 09/12/2000 | US6118351 Micromagnetic device for power processing applications and method of manufacture therefor |
| 09/05/2000 | US6114940 BALUN transformer core material, BALUN transformer core and BALUN transformer |
| 08/29/2000 | US6111465 Amplifying unit comprising an input transformer capable of contributing to a wider frequency band of a broadband amplifier |
| 08/15/2000 | CA2240768C Triple core toroidal transformer |
| 08/02/2000 | CN2390266Y Audio-frequency transformer |
| 07/19/2000 | EP1020974A1 Device for connecting a station to an electrical power network especially for automobiles |
| 07/12/2000 | CN1260083A Composite transformer for self-oscillator |
| 07/04/2000 | US6084499 Planar magnetics with segregated flux paths |
| 06/20/2000 | US6078239 High frequency transformer |
| 06/14/2000 | CN2383188Y Relay anti-thunder transformer |
| 06/13/2000 | US6075431 Converter transformer |
| 05/17/2000 | CN1253056A Output choking coil for use on D. C. welding machine and method for using same |
| 05/10/2000 | EP0999564A1 Output choke for a direct current welding device and method for adjusting the inductivity in the electrical output circuit of a direct current welding device |
| 05/09/2000 | US6060976 Plane transformer |
| 05/09/2000 | US6060876 Symmetrical power system |
| 04/11/2000 | US6049258 Isolation and signal filter transformer |
| 04/05/2000 | EP0991091A1 High voltage transformer |
| 04/05/2000 | CN1249522A High-voltage transformer |
| 03/15/2000 | EP0985264A1 Composite transformer for self-oscillator |
| 03/07/2000 | US6033593 BALUN transformer core material, BALUN transformer core and BALUN transformer |
| 03/02/2000 | WO2000011687A1 Planar transformer |
| 03/02/2000 | CA2342164A1 Planar transformer |
| 03/01/2000 | CN2366952Y Full sealing type railway signal transformer having ring shaped core |
| 12/29/1999 | CN2356409Y Small volume, high efficiency DC reactor |
| 12/09/1999 | WO1999063556A1 Safety isolating transformer |
| 12/01/1999 | CN1237081A PCB-type transformer without iron core |
| 11/09/1999 | US5982264 High frequency sheet-type transformer |
| 10/26/1999 | CA2157262C Surge arrestor for rf devices |
| 10/12/1999 | US5966064 Nanocrystalline alloy having excellent pulse attenuation characteristics, method of producing the same, choke coil, and noise filter |
| 10/06/1999 | CN1231084A Wireless energy and data transfer for modular peripheral system |
| 09/21/1999 | US5956073 Noise-limiting transformer apparatus and method for making |
| 09/07/1999 | US5949300 Line coupler |
| 09/07/1999 | US5949299 Multilayered balance-to-unbalance signal transformer |
| 08/18/1999 | CN2334137Y Electronic transformer for E-shape core self-excited semi-bridge neon lamp |
| 08/11/1999 | EP0935263A2 Operating techniques for coreless printed-circuit-board (PCB) transformers |
| 08/03/1999 | US5933332 Converter transformer |
| 07/27/1999 | US5929738 Triple core toroidal transformer |
| 07/21/1999 | EP0929948A1 Wireless energy and data transfer for a modular peripheral system |
| 07/14/1999 | CN2329077Y Active pulse transformer |
| 07/13/1999 | US5923237 Wirewound-chip balun transformer |
| 06/23/1999 | EP0923800A1 Overvoltage protection spark gaps and transformers |
| 06/23/1999 | CN2325862Y Leakage inductance type audio-frequency transformer |
| 06/22/1999 | CA2122172C Autotransformer for the transmission of baseband video |
| 06/17/1999 | WO1999030414A1 Apparatus and methods for enhancing electronic audio signals |
| 06/17/1999 | CA2313695A1 Apparatus and methods for enhancing electronic audio signals |
| 06/16/1999 | CN1043670C Nanocrystalline alloy having excellent pulse attenuation characteristics, its use and method of producing same |
| 04/29/1999 | WO1999021199A1 Electric signal transmission line |
| 04/07/1999 | CN1213146A Adjustable saturable transformer |
| 04/06/1999 | US5892667 Symmetrical power system |
| 03/24/1999 | CN2311845Y Outdoor dry mutual inductor |
| 03/03/1999 | EP0870353A4 Isolated electrical power supply |
| 02/25/1999 | DE19835639A1 High frequency transformer with strip winding for television transmission |
| 02/10/1999 | EP0896345A2 Coil element |
| 02/10/1999 | CN1207565A Coil element |
| 01/27/1999 | CN1206206A Piezoelectric substrate supporting structure for piezoelectric transformer and piezoelectric transformer provided therewith |
| 01/19/1999 | US5861790 Stackable and cost-reduced transformer with embedded EMI filters |
| 01/06/1999 | CN1204130A Iron-core material iron-core and transformer for balancing-non-balancing transformer |
| 12/30/1998 | CN1203446A Micromagnetic device for power processing applications and method of manufacture therefor |
| 12/16/1998 | EP0884783A2 A micromagnetic device for power processing applications and method of manufacture therefor |
| 12/16/1998 | EP0795184A4 Planar pulse transformer |
| 12/09/1998 | EP0883326A2 Transformer for piezoelectric speaker and piezoelectric speaker operative with said transformer |
| 12/03/1998 | WO1998054826A1 Composite transformer for self-oscillator |
| 12/02/1998 | EP0880823A1 High impedance ratio wideband transformer circuit |
| 12/02/1998 | CN2299381Y Neon lamp transformer with one-end earthing output |