| Patents for H01F 27 - Details of transformers or inductances, in general (43,362) |
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| 05/08/1991 | DE3936937A1 Winding set for moulded resin transformer - has main and auxiliary winding for each phase axially aligned along respective core limbs |
| 05/07/1991 | US5014181 Magnetic amplifier package and method of cooling the same |
| 05/01/1991 | CN2076267U Voltage-regulating winding structure for delta connection transformer |
| 05/01/1991 | CA2028987A1 Transformer bushing for field control of hvdc |
| 04/30/1991 | US5012125 Shielded electrical wire construction, and transformer utilizing the same for reduction of capacitive coupling |
| 04/23/1991 | US5010314 Low-profile planar transformer for use in off-line switching power supplies |
| 04/23/1991 | US5010313 Chip coil |
| 04/17/1991 | EP0422009A1 Improved capacitor with controlled impedance. |
| 04/17/1991 | CN2075380U Core of transformer |
| 04/16/1991 | US5008643 Ignition coil having a divided high tension winding, in particular for internal combustion engines |
| 04/11/1991 | DE3932750A1 Underwater inductor with coils and yoke in shockproof housing - uses semi-rigid sealing compounded and O=rings to locate inner assembly |
| 04/10/1991 | EP0421514A1 Pulse transformer |
| 04/10/1991 | CN2074936U Air relay |
| 04/10/1991 | CN2074931U Low-voltage series reactance |
| 04/06/1991 | CA2026136A1 Pulse transformer |
| 04/04/1991 | WO1991004565A1 Transformer and connector assembly |
| 04/04/1991 | WO1991004411A1 Ignition coil |
| 04/03/1991 | EP0419832A1 Support member for endwindings of electric coils |
| 04/02/1991 | USH906 Wedge assembly for electrical transformer component spacing |
| 04/02/1991 | US5005100 Transient-filtered transformer |
| 04/02/1991 | US5004974 Electric current sensing device |
| 04/02/1991 | CA1282457C Magnetic field screens |
| 03/28/1991 | DE3930587A1 Zuendspule Ignition Coil |
| 03/27/1991 | EP0418775A1 Phase and amplitude modulation circuit |
| 03/27/1991 | EP0418538A1 Improvements in or relating to balun transformers |
| 03/26/1991 | US5003452 High-voltage supply device for an x-ray tube |
| 03/26/1991 | US5003279 Chip-type coil |
| 03/26/1991 | US5003278 Ferrite suppressor case with retaining fingers |
| 03/21/1991 | DE3930107A1 Terminal strip block for sec. side of LV transformers - uses PCB hidden on underside of baseplate for power supply distribution |
| 03/20/1991 | CN2073615U Duplex shielded mutual inducer |
| 03/19/1991 | US5001448 Shield for a magnet |
| 03/14/1991 | DE3930492A1 Laminated core shank for transformer - exhibits uninterrupted surface of all shanks without centering bores |
| 03/13/1991 | EP0416959A1 Magnetic field generating system |
| 03/13/1991 | EP0203083B1 Folded rf marker for electronic article surveillance systems |
| 03/13/1991 | CN2073152U High voltage winding inner shielding structure of transformer |
| 03/12/1991 | US4999743 Transformer with included current sensing element |
| 03/07/1991 | DE3929514A1 Miniature inductive component for HF and VHF range - has axis of wound wire vertical to base support of plastics material to allow surface mounting |
| 03/06/1991 | EP0415495A2 Transformers for intermittent operation at clock frequencies |
| 03/06/1991 | CN2072721U Damp-proof explosion-proof device of high-tension mutual-inductor |
| 02/27/1991 | EP0414315A1 Inductive device |
| 02/27/1991 | EP0413848A1 Adaptor plate for electric coils |
| 02/27/1991 | CN2072274U Gas relay |
| 02/27/1991 | CN2072267U Inverted current transformer winding fastening structure |
| 02/27/1991 | CN1011840B Mold transformer |
| 02/20/1991 | EP0413348A2 Semiconductor integrated circuit |
| 02/20/1991 | EP0413103A1 Condenser type barrier |
| 02/20/1991 | CN2071824U Insulation structure of high-voltage winding layer for voltage mutual-inductor |
| 02/20/1991 | CN2071823U Auti-electricity-stealing hood for transformer |
| 02/20/1991 | CN1049395A 点火线圈 Ignition coils |
| 02/20/1991 | CN1049394A 点火线圈 Ignition coils |
| 02/19/1991 | US4993140 Method of making transformers and cores for transformers |
| 02/19/1991 | CA1280499C Heat exchangers and electrical apparatus having heat exchangers |
| 02/19/1991 | CA1280475C Transformer structure |
| 02/13/1991 | EP0412679A1 Ignition coil |
| 02/13/1991 | EP0412678A1 Ignition coil |
| 02/13/1991 | EP0412296A1 Method for winding coils, particularly for position sensors |
| 02/12/1991 | US4992769 Line transformer |
| 02/12/1991 | US4992624 Magnetic shield for visual display terminals |
| 02/10/1991 | CA2013124A1 Ignition coil |
| 02/10/1991 | CA2012485A1 Ignition coil |
| 02/06/1991 | EP0411697A1 Magnetic bearings |
| 02/06/1991 | CN2070944U Full sealing inversion stopping respirator for filling oil mutual-inductor |
| 02/05/1991 | US4990880 Transformer clip |
| 02/05/1991 | US4990202 Cofiring green compact and magnetic material |
| 01/30/1991 | EP0410526A1 Generator for generating an electric voltage |
| 01/30/1991 | CN2070495U Power transformer core theft-proof protector |
| 01/29/1991 | US4988968 Double insulated transformer and bobbin case thereof |
| 01/23/1991 | EP0409479A1 A method of making an electromagnetical apparatus |
| 01/23/1991 | CN1048767A Electric appliance soaked in insulating liquid |
| 01/16/1991 | EP0408230A2 Semi-compacted litz-wire cable strands spaced for coolant flow about individual insulated strands |
| 01/16/1991 | EP0407823A2 Insulating-liquid immersed electrical machine |
| 01/16/1991 | CN2069606U Transformer for steel belt welding machine |
| 01/16/1991 | CN1048627A High permeance current transformer |
| 01/16/1991 | CN1048626A Shunt reactor common type transformer |
| 01/11/1991 | CA2020766A1 Multi-tap primary coil for gas discharge lamps |
| 01/10/1991 | WO1991000642A1 Power supply with integral filter and cooling device |
| 01/09/1991 | EP0406555A1 Shared shunt reactor type transformer |
| 01/09/1991 | CN2069164U Reactance three phase pulse width modulation |
| 01/09/1991 | CN1011170B Electric converter |
| 01/09/1991 | CN1011155B Ignition coil for ignition system of internal combustion engines |
| 01/08/1991 | US4984130 Surface mounting |
| 01/08/1991 | US4983943 Magnetic core and method of manufacturing same |
| 01/08/1991 | US4983934 Noise filter |
| 01/08/1991 | US4983932 Electric noise absorber |
| 01/08/1991 | US4983859 Magnetic device for high-voltage pulse generating apparatuses |
| 01/08/1991 | US4983222 Two-stage cleaning with degreasing agent; disassembly and recovering parts |
| 01/03/1991 | DE3920732A1 Electric, high power, encased transformer - has each coil and associated insulating barriers with polygonal contour and rounded corners |
| 01/02/1991 | EP0405126A2 Electrostatic spray gun |
| 01/01/1991 | US4980972 Method of making a conductor for a high energy density hyperconducting inductor |
| 12/27/1990 | EP0403855A1 Insulating spacer |
| 12/26/1990 | CN2068274U Current transformer |
| 12/26/1990 | CN2068273U Flexible jointed oil flow relay |
| 12/26/1990 | CN1048120A Lightning preventing device for distribution transformer |
| 12/25/1990 | US4980794 Electromagnetic contactor with lightweight wide range current transducer with sintered powdered metal core |
| 12/25/1990 | US4980664 Transformer bobbin |
| 12/25/1990 | US4980654 Transmission line transformer |
| 12/25/1990 | US4980515 Electrical apparatus with an in-tank electromagnetic shield |
| 12/19/1990 | CN2067887U Cooler with inner rib steel tube and rectangular fins |
| 12/19/1990 | CN2067856U Insulation structure for voltage mutual inductor |
| 12/18/1990 | US4978920 Magnetic field screens |