| Patents for H01F 30 - Fixed transformers not covered by group (4,595) |
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| 10/06/1993 | EP0564334A1 Device for detecting and indicating a fault current in an arrester or insulator |
| 09/30/1993 | WO1993019477A1 Three phase transformer |
| 09/22/1993 | EP0561717A1 Measuring combination with current sensor and power supply transformer |
| 09/14/1993 | US5245521 Suppression of transformer capacitive current |
| 09/01/1993 | EP0558428A1 Toroidal transformer for class A differential sensor |
| 09/01/1993 | EP0557549A1 Toroidal core transformer |
| 09/01/1993 | EP0557378A1 A power supply circuit with integrated magnetic components. |
| 08/31/1993 | US5241236 Piezoelectric ceramic transformer being driven with thickness extensional vibration |
| 08/18/1993 | EP0555560A1 Low leakage transformer |
| 08/05/1993 | WO1993015515A1 Three phase transformer with frame shaped winding assemblies |
| 07/14/1993 | CA2086897A1 Toroidal transformer and method for making |
| 07/08/1993 | WO1993013588A1 Five-leg core type three-fold frequency multiplier |
| 07/06/1993 | US5225971 Three coil bridge transformer |
| 07/06/1993 | US5225803 High voltage transformer, notably for an x-ray apparatus |
| 07/06/1993 | US5225802 Low loss spiders |
| 06/23/1993 | EP0547120A1 Power transformers and coupled inductors with optimum interleaving of windings. |
| 06/22/1993 | US5221892 Flux compression transformer |
| 06/17/1993 | DE4241689A1 Step=up transformer with sepd. prim. and sec. windings - arranged end=to=end along axis of winding sleeve and electromagnetically coupled by core |
| 06/16/1993 | CN1073309A High energy dissipation harmonic reactor |
| 05/25/1993 | US5214403 Inductive device comprising a toroidal core |
| 05/19/1993 | EP0542445A1 Flat transformer |
| 05/16/1993 | CA2065687A1 Transformer with cancellation of harmonic currents by non-linear loads |
| 05/04/1993 | US5208572 Air-core reactor with a magnetic shield |
| 04/28/1993 | EP0425574A4 Transformer having symmetrical push-pull windings |
| 04/27/1993 | US5206539 Transformer with cancellation of harmonic currents by phase shited secondary windings |
| 04/13/1993 | US5202664 Three phase transformer with frame shaped winding assemblies |
| 04/13/1993 | US5202584 High energy dissipation harmonic filter reactor |
| 03/31/1993 | EP0533899A1 High voltage dc source |
| 03/17/1993 | EP0532360A1 Transformer with controlled interwinding coupling and controlled leakage inductances and circuit using such transformer |
| 03/17/1993 | EP0531687A2 Low cost high frequency switched mode converter and method for making same |
| 03/03/1993 | EP0529905A1 High energy dissipation harmonic filter reactor |
| 02/03/1993 | EP0525459A1 Transmission device |
| 01/26/1993 | US5182537 Transformer with twisted conductors |
| 01/26/1993 | US5182535 Summing transformer core for star-delta inverter having a separate secondary winding for each primary winding |
| 01/13/1993 | EP0522014A1 Cable coupling transformer. |
| 01/05/1993 | US5177460 Summing transformer for star-delta inverter having a single secondary winding for each group of primary windings |
| 01/05/1993 | US5175923 Method for producing a laminated coil |
| 01/05/1993 | CA1312360C Sensitive fault detection system for parallel coil air core reactors |
| 12/16/1992 | EP0518565A1 Method of making distribution transformers |
| 12/02/1992 | EP0516454A1 Transformers |
| 12/01/1992 | US5168255 Three phase transformer |
| 11/24/1992 | US5166965 High voltage dc source including magnetic flux pole and multiple stacked ac to dc converter stages with planar coils |
| 11/19/1992 | EP0514136A1 An improved transformer |
| 11/03/1992 | US5161098 AC adaptor |
| 11/03/1992 | US5160820 Welding transformer and method of manufacturing same |
| 10/28/1992 | EP0510474A1 Adjusting device |
| 10/28/1992 | EP0510252A1 Coaxial isolation mounting of a toroidal transformer |
| 10/21/1992 | EP0284615B1 Magnetic material biasing method and apparatus |
| 10/12/1992 | WO1992019085A1 High voltage dc source |
| 10/12/1992 | CA2085110A1 High voltage dc source |
| 10/06/1992 | CA1308438C Inductor apparatus for application to ferroresonant regulators |
| 09/30/1992 | CN1064974A 变换器 Converters |
| 09/15/1992 | US5148357 Auto-connected hexagon transformer for a 12-pulse converter |
| 09/15/1992 | US5147983 Six phase distribution powerline |
| 09/15/1992 | US5146905 Capacitor discharge ignition system with double output coil |
| 09/02/1992 | EP0501850A1 Magnetic chip component |
| 08/19/1992 | EP0499311A1 Transformer |
| 08/12/1992 | CN1017846B Shunt reactor common type transformer |
| 08/05/1992 | EP0497631A2 Transformer with capacitive current suppresion |
| 08/05/1992 | EP0497219A2 Integrated magnetic power converter core |
| 07/01/1992 | CN1062428A Mini-transformer and method for producing same |
| 06/30/1992 | US5126715 Low-profile multi-pole conductive film transformer |
| 06/17/1992 | EP0490682A1 Small, high-resolution color display apparatus |
| 06/17/1992 | EP0490438A1 Inductive device comprising a toroidal core |
| 06/10/1992 | CN1017008B Transformer for compensating phase |
| 05/29/1992 | WO1992009136A1 A power supply circuit with integrated magnetic components |
| 05/26/1992 | US5117214 Integrated magnetic power converter core |
| 05/13/1992 | EP0485341A1 Small transformer, and process for manufacturing same |
| 05/06/1992 | EP0483486A2 Three phase delta reference transformer |
| 04/29/1992 | CN1016474B Small transformer |
| 04/21/1992 | CA1299259C Modular high frequency power transformer |
| 04/07/1992 | US5103201 Switching mode power transformer |
| 04/07/1992 | US5101803 Ignition coil |
| 03/19/1992 | WO1992004723A1 Power transformers and coupled inductors with optimum interleaving of windings |
| 03/19/1992 | DE4029097A1 Self-cooling three=phase dry type transformer - has core with triangular layout in gas insulated housing |
| 03/18/1992 | EP0475522A1 Transformer |
| 03/17/1992 | CA1297546C Ferroresonant transformer with dual outputs |
| 03/05/1992 | WO1992003834A1 High voltage isolation transformer |
| 03/03/1992 | US5093646 High frequency matrix transformer |
| 03/03/1992 | US5093614 Three phase delta reference transformer |
| 02/19/1992 | EP0471183A2 Minimizing network harmonics from transformer circuits |
| 01/22/1992 | EP0466707A1 Welding apparatus and transformer therefor |
| 01/14/1992 | CA1294328C Method and apparatus for minimizing the magnetizing current passing through a transformer |
| 01/08/1992 | EP0464924A1 High voltage transformer, particularly for an X-ray apparatus |
| 01/02/1992 | EP0287645B1 Inductive coupled power system |
| 01/02/1992 | DE4020609A1 Transformer for stunning pig - provides rapid peaking of secondary voltage and current, operating in saturation region |
| 12/31/1991 | US5077458 Resistance welding apparatus with gun-arm mounted transformer |
| 12/03/1991 | US5070441 Distribution of power from a six phase powerline to one- and three- phase loads |
| 11/26/1991 | US5068509 High frequency thermode driven device employing one-turn-secondary transformers |
| 11/05/1991 | US5063487 Main and auxiliary transformer rectifier system for minimizing line harmonics |
| 10/22/1991 | US5059936 Toroidal hybrid transformer |
| 10/16/1991 | EP0451628A1 Choke-coil/transformer combination for operating high pressure metal vapor lamps of vehicle electrical systems |
| 10/15/1991 | US5057808 Transformer with voltage balancing tertiary winding |
| 10/09/1991 | EP0450448A1 Flat-type transformer |
| 10/03/1991 | WO1991015022A1 Cable coupling transformer |
| 10/01/1991 | US5053599 Welding gun assembly with transformers |
| 10/01/1991 | CA1290014C Ferroresonant three-phase constant ac voltage transformer |
| 09/12/1991 | DE4104386A1 Electronic pulse generator esp. for electric fence - uses pulse transformer made from high permeable material to increase efficiency |
| 08/07/1991 | WO1991012107A1 Welding apparatus and transformer therefor |
| 08/07/1991 | CA2050581A1 Welding apparatus and transformer therefor |