| Patents for H01F 30 - Fixed transformers not covered by group (4,595) |
|---|
| 07/26/1989 | EP0325467A1 Modular high frequency power transformer |
| 07/18/1989 | US4847986 Method of making square toroid transformer for hybrid integrated circuit |
| 07/11/1989 | US4847583 Toroidal transformer with integrated self-inductance device |
| 07/05/1989 | CN1033712A Miniature high frequency power transformer |
| 07/04/1989 | CA1256956A1 Inductance adjustment for transformers |
| 06/07/1989 | EP0318955A1 Miniature high frequency power transformer |
| 06/06/1989 | US4837497 Variable transformer, reactor and method of their control |
| 05/31/1989 | EP0318322A1 Transformer component mounting assembly |
| 05/30/1989 | US4835431 Transformer and synchronous machine with stationary field winding |
| 05/23/1989 | US4833436 Formed metal core blocking |
| 05/23/1989 | US4833337 Inductive coupled power system |
| 05/18/1989 | WO1989004541A1 Controlled transformer |
| 05/16/1989 | US4831352 Rectifier transformer |
| 05/02/1989 | US4827097 Continuous transformer and motor |
| 04/27/1989 | DE3741391C1 Winding element for a winding on an enclosed core |
| 04/26/1989 | CN1032603A Transformer insulation barrier and method for manufacture |
| 04/24/1989 | EP0287645A4 Inductive coupled power system. |
| 04/06/1989 | WO1989002795A1 Transformer insulation barrier and method for manufacture |
| 04/05/1989 | EP0309837A1 Transformer, especially for a switching power supply |
| 03/21/1989 | US4814735 Magnetic core multiple tap or windings devices |
| 03/14/1989 | US4812607 Compensation for improved continuous transformer and motor |
| 03/14/1989 | US4811477 Method of winding toroid transformers |
| 02/15/1989 | EP0302856A1 Improvements in ferroresonant constant-voltage transformers. |
| 01/31/1989 | US4801776 Flux reduction compensation for continuous transformer and motor |
| 01/31/1989 | US4801775 Shading band compensation for continuous transformer and motor |
| 01/24/1989 | US4800356 Shunt transformer |
| 01/11/1989 | EP0298878A1 Toroidal transformer with an integrated self-induction device |
| 01/03/1989 | US4796143 Electric transformer for underground mining machine |
| 11/17/1988 | WO1988009042A1 High coupling transformer adapted to a cutting supply circuit and cutting supply circuit including such a transformer |
| 11/17/1988 | EP0291403A1 Transformer with a strong coupling for chopped supply circuit and supply circuit comprising such a transformer |
| 11/16/1988 | CN87103405A Continuous transformer and motor |
| 11/01/1988 | US4782437 Magnetic material biasing method and apparatus |
| 10/26/1988 | EP0287645A1 Inductive coupled power system. |
| 10/25/1988 | US4780804 Method and an arrangement for enabling the magnetizing current passing through a transformer to be minimized when an asymmetric load is applied to the secondary side of the transformer |
| 10/25/1988 | US4779812 Toroidal electrical transformer and method of producing same |
| 10/11/1988 | US4777466 Connector arrangement for electrical circuits in underwater installations, and transformer particularly for use in such arrangement |
| 10/11/1988 | US4777465 Square toroid transformer for hybrid integrated circuit |
| 10/05/1988 | EP0284615A1 Magnetic material biasing method and apparatus. |
| 09/21/1988 | EP0282953A1 Rectifier transformer |
| 08/09/1988 | US4763093 High-power pulse transformer for short high-voltage and/or high-current pulses |
| 08/03/1988 | EP0276419A2 Toroidal-core transformer with at least two windings |
| 07/27/1988 | EP0275483A1 Three-phase transformer for cycloconverter |
| 07/26/1988 | US4760366 Ferrite core |
| 07/12/1988 | US4757171 Continuous transformer and motor |
| 06/28/1988 | US4752999 Spherical transformer |
| 06/07/1988 | US4750101 Transformer apparatus with rectifier |
| 05/11/1988 | DE3636938A1 Heizwandler fuer einen roentgengenerator Filament converter for a roentgengenerator |
| 05/05/1988 | WO1988003355A1 Heat convertor for an x ray generator |
| 05/04/1988 | EP0265938A2 DC-DC converter |
| 05/03/1988 | US4741484 Apparatus and method for winding a magnetic core for toroidal transformer |
| 04/21/1988 | WO1988002944A1 Inductive coupled power system |
| 04/20/1988 | CN87106277A Formed metal core blocking |
| 04/13/1988 | EP0263626A2 Displacement transducers |
| 03/24/1988 | WO1988002177A1 Formed metal core blocking |
| 03/23/1988 | EP0260500A1 Device for testing three-phase coils used in electric high-tension supply networks |
| 03/10/1988 | WO1988001791A1 Magnetic material biasing method and apparatus |
| 03/08/1988 | US4730241 Laminated hybrid integrated DC-DC converter |
| 02/16/1988 | US4724602 Autotransformer with common winding having oppositely wound sections |
| 02/09/1988 | US4724413 Low-noise transformer |
| 02/03/1988 | EP0254946A1 A single phase auto transformer |
| 01/12/1988 | CA1231399A1 Low core loss rotating flux transformer |
| 12/22/1987 | CA1230652A1 Power transformer for use with very high speed integrated circuits |
| 12/15/1987 | US4713642 Face connected instrument transformer |
| 11/17/1987 | CA1229390A1 Transformer and process for its fabrication |
| 11/11/1987 | EP0245083A1 A ferrite core and a transformer or inductor including it |
| 11/11/1987 | EP0244845A2 Continuous transformer and motor |
| 11/10/1987 | US4706017 Electrical current sensor |
| 11/05/1987 | DE3613861A1 Silenced inductive electrical component |
| 11/04/1987 | EP0243862A2 Electric converter |
| 10/29/1987 | DE3613797A1 Device for transmitting electrical signals |
| 10/22/1987 | DE3708804A1 Transformer |
| 10/20/1987 | US4701830 Electronic circuit module |
| 09/15/1987 | US4694140 AC power supply |
| 09/11/1987 | WO1987005412A1 Improvements in ferroresonant constant-voltage transformers |
| 08/18/1987 | US4687947 Electrical power conservation circuit |
| 08/04/1987 | US4684882 Electrical transformer having a solid core surrounding winding in a loop configuration |
| 08/04/1987 | US4683919 Apparatus and method for fabricating a high voltage winding for a toroidal transformer |
| 07/21/1987 | US4682000 Welding transformer and rectifier assembly |
| 07/14/1987 | US4680686 Electric 3-phase supply device for an ozonizer |
| 06/30/1987 | US4677411 Explosion-proof or flame-proof plug having a transformer disposed in a compression-resistant chamber |
| 06/25/1987 | DE3703571A1 Ball-type transformer |
| 06/10/1987 | EP0225316A1 Method and apparatus for winding wedge-shaped segments for an electrical coil of an electrical transformer |
| 05/26/1987 | CA1222294A1 Safety transformer |
| 05/06/1987 | EP0220494A2 DC to DC energy conversion system |
| 05/06/1987 | EP0220263A1 Electrical connector arrangement for underwater installations |
| 05/05/1987 | US4663700 Way of placing chokes with air core |
| 04/21/1987 | US4658799 Ignition coil assembly for internal combustion engines |
| 04/01/1987 | EP0216500A1 Electromagnetic induction apparatus |
| 03/25/1987 | EP0215286A1 High power pulse transformer for short high-voltage and/or high-current pulses |
| 03/24/1987 | US4652776 Circuit using a multi-path magnetic core with common output limb |
| 03/24/1987 | US4652771 Oscillating flux transformer |
| 03/24/1987 | US4651412 Electric transformer and method for the manufacture of the transformer |
| 03/17/1987 | US4649639 Method of building toroidal core electromagnetic device |
| 03/03/1987 | US4646803 Case for protecting a magnetic core |
| 03/03/1987 | CA1218714A1 Core form transformer for selective cancellation of subsynchronous resonance |
| 02/19/1987 | DE3529011A1 High-voltage transformer having a core |
| 01/27/1987 | US4639707 Transformer with toroidal magnetic core |
| 01/27/1987 | US4639705 Transformer with gapless core on support |
| 01/27/1987 | US4639610 Rotating flux transformer |
| 01/21/1987 | EP0209500A1 Method and arrangement at a transformer |