| Patents for H01F 19 - Fixed transformers or mutual inductances of the signal type (1,296) |
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| 11/25/1998 | EP0880226A2 Wirewound balun transformer |
| 11/18/1998 | CN1199515A High impedance ratio wideband transformer circuit |
| 11/04/1998 | EP0875908A1 High frequency transformer |
| 11/03/1998 | US5831505 Choke coil |
| 10/14/1998 | EP0870353A1 Isolated electrical power supply |
| 09/30/1998 | CN2293111Y Distribution transformer |
| 09/22/1998 | US5812045 Inverter transformer |
| 09/16/1998 | EP0865048A1 Stackable and cost-reduced transformer with embedded EMI filters |
| 09/15/1998 | CA2101222C Adapter for video and audio transmission |
| 09/01/1998 | US5801602 Isolation and signal filter transformer |
| 08/25/1998 | US5798902 Linearity signal coupler |
| 08/19/1998 | EP0858666A1 Rf transformer using multilayer metal polymer structures |
| 07/14/1998 | US5781071 Transformers and amplifiers |
| 07/08/1998 | EP0852428A2 Multilayered balance-to-unbalance signal transformer |
| 06/24/1998 | EP0849747A1 Noise-limiting transformer apparatus and method for making |
| 06/09/1998 | US5761791 Method of manufacturing a chip transformer |
| 06/04/1998 | WO1998024177A1 Unbalanced to balanced high impedance ratio wideband transformer circuit |
| 05/05/1998 | US5745981 Method for making magnetic and electromagnetic circuit components having embedded magnetic materials in a high density interconnect structure |
| 04/21/1998 | US5742213 Unbalanced to balanced high impedance ratio wideband transformer circuit |
| 04/15/1998 | EP0836203A2 Amplifying unit comprising an input transformer capable of contributing to a wider frequency band of a broadband amplifier |
| 04/09/1998 | WO1998015069A1 Wireless energy and data transfer for a modular peripheral system |
| 04/07/1998 | US5736916 High frequency pulse transformer for an IGBT gate drive |
| 04/02/1998 | DE19640367A1 Leitungslose Energie- und Datenübertragung für ein modulares Peripherie-System Line contact energy and data transmission for a modular peripheral system |
| 03/25/1998 | CN1177191A Choke coil |
| 03/24/1998 | US5731740 Circuit bias via transformer |
| 03/12/1998 | WO1998010498A1 Overvoltage protection spark gaps and transformers |
| 02/25/1998 | EP0681758B1 Dc/dc converter for low output voltages |
| 11/18/1997 | US5689180 Isolated electrical power supply |
| 11/06/1997 | WO1997041639A1 Isolation and signal filter transformer |
| 10/29/1997 | EP0803883A1 Converter transformer |
| 09/30/1997 | US5673183 DC/DC converter for low output voltages |
| 09/17/1997 | EP0795184A2 Planar pulse transformer |
| 09/03/1997 | EP0793308A1 Line coupler |
| 08/27/1997 | CN1158180A Circuit bias via transformation |
| 08/19/1997 | US5659461 Switching power supply using printed coil type transformer |
| 07/23/1997 | CN1155155A Mfg. method for wire-wound magnetic core whole-shielded transformer and product thereof |
| 07/22/1997 | US5650920 Mount for supporting a high frequency transformer in a hybrid module |
| 07/22/1997 | US5650908 Surge arrestor for RF devices |
| 07/16/1997 | CN2257954Y Dismountable zero sequence converter |
| 07/10/1997 | WO1997024735A1 High frequency transformer |
| 07/02/1997 | EP0782154A1 Flat transformer |
| 06/24/1997 | US5642276 High frequency surface mount transformer-diode power module |
| 06/19/1997 | WO1997022168A1 Isolated electrical power supply |
| 06/17/1997 | US5640314 Symmetrical power system |
| 06/11/1997 | CN2256145Y Sealed electronic transformer |
| 06/04/1997 | EP0522014B1 Cable coupling transformer |
| 06/04/1997 | CN1151083A Flexible copperless transformer device |
| 05/14/1997 | EP0772907A2 Circuit bias via transformer |
| 05/09/1997 | WO1997016836A1 Rf transformer using multilayer metal polymer structures |
| 05/07/1997 | DE19540879A1 High frequency transformer with symmetrical winding e.g. for transceivers |
| 05/07/1997 | DE19540525A1 Transformer for SMPS for generating safety electric LV, esp. for operating one or more halogen lamps |
| 04/15/1997 | US5621636 Thin DC-DC converter arrangement |
| 04/08/1997 | US5619172 High impedance ratio wideband transformer circuit |
| 03/25/1997 | US5615091 Isolation power supply |
| 03/20/1997 | WO1997010645A1 High impedance ratio wideband transformer circuit |
| 03/20/1997 | CA2231832A1 High impedance ratio wideband transformer circuit |
| 03/13/1997 | DE19532944A1 Power impedance transformer for push=pull power amplifier of mobile transmitter output-stages |
| 01/29/1997 | EP0756294A1 Mount for supporting a high frequency transformer over a component on a substrate in a hybrid module and method of assembling the hybrid module |
| 01/28/1997 | US5598327 Planar transformer assembly including non-overlapping primary and secondary windings surrounding a common magnetic flux path area |
| 01/28/1997 | US5598135 Transformer |
| 01/28/1997 | CA2150953C Flexible transformer apparatus particularly adapted for high voltage operation |
| 01/16/1997 | WO1996038908A3 Circuit bias via transformer |
| 01/09/1997 | WO1997001177A1 Selv-generating transformer for supply switches |
| 12/27/1996 | WO1996042095A1 Flat transformer |
| 12/11/1996 | EP0747914A2 High frequency pulse transformer for an IGBT gate drive |
| 12/05/1996 | WO1996038908A2 Circuit bias via transformer |
| 11/26/1996 | US5579202 Transformer device |
| 11/20/1996 | CN2240772Y Transformer for railway signal |
| 11/13/1996 | CN2240191Y Rail thunder-proof transformer for railway signal |
| 11/05/1996 | US5572435 Method for designing a transformer |
| 11/05/1996 | US5572179 Thin film transformer |
| 10/30/1996 | CN2239068Y Power switch transformer for broadcast sending machine |
| 10/08/1996 | US5563536 Driver circuit having low voltage detection and high current detection |
| 09/24/1996 | US5559486 Bobbin for high frequency core |
| 09/11/1996 | EP0730778A1 Flexible transformer apparatus particularly adapted for high voltage operation |
| 09/11/1996 | EP0640241B1 Step switch |
| 09/04/1996 | CN1130293A Method for producing composite monolithic structure piezoelectric ceramic transformer |
| 09/04/1996 | CN1130292A Multiple layer piezoelectric ceramic transformer and its producing method |
| 08/14/1996 | EP0726642A1 High frequency surface mount transformer-diode power module |
| 08/07/1996 | CN2232618Y Transformer using magnetic material protection box as low-voltage winding |
| 07/31/1996 | EP0724332A1 Switching device for a high voltage circuit with pulse transformers |
| 07/17/1996 | CN2231444Y AC stabilized transformer with strong overload ability |
| 06/11/1996 | US5525941 Magnetic and electromagnetic circuit components having embedded magnetic material in a high density interconnect structure |
| 06/06/1996 | WO1996017360A1 Planar pulse transformer |
| 06/04/1996 | US5522946 Amorphous magnetic thin film and plane magnetic element using same |
| 05/23/1996 | WO1996015560A1 Composite piezoelectric ceramic transformer and manufacture method thereof |
| 05/14/1996 | US5516992 Transformer tap changing and step switch assembly |
| 05/01/1996 | CN2226335Y High-frequency transformer for low-temp rise contravariant power supply |
| 04/16/1996 | US5508673 High frequency transformer apparatus |
| 04/02/1996 | US5504469 Electrical conductors |
| 03/05/1996 | US5497137 Chip type transformer |
| 02/28/1996 | EP0476114B1 Low-profile planar transformer for use in off-line switching power supplies |
| 02/14/1996 | CN2220115Y Miniature insulating isolation transformer |
| 01/30/1996 | US5488352 Communications and control system for tractor/trailer and associated method |
| 01/11/1996 | DE19523976A1 SMPS with transformer having printed winding |
| 12/19/1995 | US5477204 Radio frequency transformer |
| 12/05/1995 | US5473300 Cable coupling transformer |
| 11/15/1995 | EP0681758A1 Dc/dc converter for low output voltages |
| 10/11/1995 | EP0676779A1 Method for making a transformer |
| 10/02/1995 | EP0730778A4 Flexible transformer apparatus particularly adapted for high voltage operation |