| Patents for H01F 30 - Fixed transformers not covered by group (4,595) |
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| 07/17/1991 | EP0436969A1 High frequency thermode driver employing one-turn-secondary transformers |
| 07/17/1991 | EP0436665A1 Variable speed, constant frequency generating system with input transformer |
| 07/12/1991 | CA2023319A1 High frequency thermode driver employing one-turn-secondary transformers |
| 07/11/1991 | WO1991010245A1 Transformer with voltage balancing tertiary winding |
| 07/11/1991 | WO1991010244A1 Toric-type transformer |
| 07/10/1991 | EP0436434A1 Toroidal transformer |
| 07/09/1991 | US5030813 Welding apparatus and transformer therefor |
| 06/25/1991 | US5027099 Sensitive fault detection system for parallel coil air core reactors |
| 06/18/1991 | US5025241 Transformer of ferrite closed magnetic circuit type |
| 06/12/1991 | EP0431322A1 Ignition coil |
| 06/11/1991 | US5023768 High voltage high power DC power supply |
| 05/29/1991 | EP0429315A2 High voltage high power DC power supply |
| 05/25/1991 | CA2030582A1 High voltage high power dc power supply |
| 05/23/1991 | DE3938577A1 Permanent magnet transformer generating electrical pulses - uses four-limbed yoke including magnet for three sec. windings |
| 05/15/1991 | EP0302856B1 Improvements in ferroresonant constant-voltage transformers |
| 05/08/1991 | EP0425574A1 Transformer having symmetrical push-pull windings |
| 05/07/1991 | CA1283944C Continuous transformer and motor |
| 03/26/1991 | US5003277 Phase-shifting transformer with a six-phase core |
| 03/26/1991 | CA1282010C Inductive coupled power system |
| 02/06/1991 | EP0411171A1 Own demand supply for a medium voltage switchgear device |
| 01/21/1991 | WO1991001040A1 Three-phase transformer |
| 01/16/1991 | CN1048626A Shunt reactor common type transformer |
| 01/09/1991 | EP0406555A1 Shared shunt reactor type transformer |
| 01/08/1991 | US4983859 Magnetic device for high-voltage pulse generating apparatuses |
| 12/18/1990 | US4978906 Picture frame matrix transformer |
| 12/12/1990 | EP0370102A4 High frequency matrix transformer |
| 12/04/1990 | US4975822 Harmonic reduction for multi-bridge converters |
| 12/04/1990 | US4975670 Air cooled transformer |
| 11/27/1990 | US4973930 Twin coil |
| 11/27/1990 | CA1276974C Welding transformer and rectifier assembly |
| 11/22/1990 | EP0398176A2 Harmonic reduction for multi bridge converters |
| 11/08/1990 | DE3913558A1 Transformer with ferrite windings - has core with primary and secondary coils arranged on common sections in alternate manner |
| 10/23/1990 | US4965712 Transformer having plural-turn core |
| 10/09/1990 | US4962362 Multi-magnetic field plural core transformer |
| 10/03/1990 | EP0390643A1 Transformer of the closed ferrite magnetic circuit type |
| 09/25/1990 | CA1274588A1 Face connected instrument transformer |
| 09/18/1990 | USRE33345 Toroid transformers and secondary windings |
| 09/12/1990 | CN1009596B Method and arrangement for controlling the magnetizing current passing through a transformer |
| 07/24/1990 | US4943763 Ferroresonant transformer with dual outputs |
| 06/26/1990 | US4937730 Constant voltage power supply |
| 06/26/1990 | US4937729 Chopper power supply including a printed circuit transformer |
| 06/13/1990 | DE3841412A1 Transformer, especially power transformer |
| 06/12/1990 | US4933830 Switching power supply |
| 06/05/1990 | US4931761 Compact transformer |
| 05/30/1990 | EP0370102A1 High frequency matrix transformer |
| 05/29/1990 | US4930059 Switched-mode DC-to-DC power converter |
| 05/22/1990 | US4928020 Saturable inductor and transformer structures for magnetic pulse compression |
| 05/17/1990 | WO1990005406A1 Variable speed, constant frequency generating system with input transformer |
| 05/01/1990 | US4922405 High voltage transformer |
| 04/25/1990 | EP0365407A1 Power transformer with reduced heat generation |
| 04/24/1990 | CA1268219A1 Ac power supply with improved cooling means |
| 04/10/1990 | US4916425 Electromagnetic device |
| 03/27/1990 | US4912618 Variable speed, constant frequency generating system with input transformer |
| 03/14/1990 | CN1040456A Transformer for compensating phase |
| 03/13/1990 | US4908753 High-tension power supply for an image recorder |
| 03/06/1990 | US4906960 Distribution transformer with coiled magnetic circuit |
| 03/06/1990 | US4906859 Power supply circuit with symmetrically tapped auto-transformer |
| 03/06/1990 | CA1266516A1 A.c. "and" gate |
| 03/06/1990 | CA1266505A1 D.c. to d.c. converter |
| 03/01/1990 | DE3928223A1 Magnetic device for HV pulse generator |
| 02/21/1990 | EP0355023A1 Phase-shifting transformer with a six-phase core |
| 02/13/1990 | US4901048 Magnetic core multiple tap or windings devices |
| 02/08/1990 | WO1990001232A1 Transformer having symmetrical push-pull windings |
| 01/31/1990 | EP0352969A2 Plank and frame transformer |
| 01/31/1990 | EP0352924A2 Inductive device |
| 01/30/1990 | US4897626 Cooling electromagnetic devices |
| 01/30/1990 | US4896839 Apparatus and method for winding a strip of material into an arcuate elongate passage |
| 01/24/1990 | EP0351583A1 Twin coil |
| 01/17/1990 | EP0350767A1 Audio winding bridging an air gap |
| 01/17/1990 | EP0350520A1 Noise filter and method of making the same |
| 01/17/1990 | CN1006501B Inductance adjustment for transformers |
| 01/09/1990 | US4893069 Ferroresonant three-phase constant AC voltage transformer arrangement with compensation for unbalanced loads |
| 12/27/1989 | EP0348316A1 Device with an electric, annular, insulated coil |
| 12/21/1989 | DE3919569A1 Transformer |
| 12/21/1989 | DE3918187A1 Iron core for electromagnetic appliances |
| 12/12/1989 | US4887061 Transformer for a flyback type converter |
| 11/29/1989 | EP0343886A2 Circuit arrangements |
| 11/21/1989 | CA1263159A1 Oscillating flux transformer |
| 11/21/1989 | CA1263158A1 Rotating flux transformer |
| 11/21/1989 | CA1263157A1 Rotating flux transformer |
| 11/08/1989 | EP0340800A1 Moving magnetic field electric power converter |
| 11/02/1989 | WO1989010654A1 High frequency matrix transformer |
| 11/02/1989 | EP0339827A1 Flat voltage transformer |
| 10/24/1989 | US4875277 Formed metal core blocking method |
| 10/19/1989 | WO1989009994A1 Saturable inductor and transformer structures for magnetic pulse compression |
| 10/11/1989 | CN1036289A Modular high frequency power transformer |
| 10/04/1989 | EP0335142A1 Transformer for switching network |
| 10/04/1989 | CN1036102A Small transformer |
| 09/26/1989 | US4870558 Moving magnetic field electric power converter |
| 09/26/1989 | CA1260088A1 High-power pulse transformer for short high-voltage and/or high-current pulses |
| 09/19/1989 | US4868533 Transformer with a one-piece primary winding and housing |
| 09/19/1989 | US4868532 Transformer with a two-piece primary winding and housing |
| 09/12/1989 | US4866407 Noise filter and method of making the same |
| 09/06/1989 | EP0330658A1 Heat convertor for an x ray generator |
| 09/05/1989 | US4864486 Plank and frame transformer |
| 08/29/1989 | US4862129 Single-turn primary and single-turn secondary flat voltage transformer |
| 08/22/1989 | US4860187 Magnetic flux coupled voltage multiplication apparatus |
| 08/15/1989 | US4857878 Modular high frequency power transformer |
| 08/01/1989 | US4853664 Three-phase transformer for cycloconverter |
| 07/27/1989 | WO1989006860A1 Transformer |