Patents
Sitemap › H01 - Basic electric elements › H01F - Magnets; Inductances; Transformers; Selection of materials for their magnetic properties › H01F 30 - Fixed transformers not covered by group
Patents for H01F 30 - Fixed transformers not covered by group (4,595)
06/1983
06/28/1983US4390813 Transformer for driving Class D amplifier
06/23/1983WO1983002194A1 Electric transformer and method for making it
05/1983
05/18/1983EP0078908A2 Regulation transformer
05/03/1983CA1145822A1 Transformer for voltage regulators
04/1983
04/14/1983WO1983001341A1 Transformer for converting 3-phase into single-phase voltage
04/14/1983WO1983001340A1 Transformer for converting 3-phase power into dc power
03/1983
03/22/1983CA1143435A1 High voltage transformer for ac-dc converter
03/09/1983EP0073199A1 Low ripple regulated x-ray tube power supply filament transformer
02/1983
02/16/1983EP0072151A1 Transformers
02/09/1983EP0071008A1 Line transformer, in particular a transformer for a television receiver
12/1982
12/23/1982WO1982004495A1 Star-connection-to-2-delta-connection conversion transformer
12/22/1982EP0067269A1 Isolation transformer
11/1982
11/23/1982CA1136213A1 Power supply utilizing a high frequency magnetic amplifier
11/09/1982CA1135337A1 High frequency high voltage power supply
10/1982
10/27/1982EP0063183A1 Low-ripple regulated power supply for an X-ray tube and filament transformer
10/26/1982CA1134455A1 Doughnut-type transformer for resistance butt welding
10/13/1982EP0062510A1 An inductor
09/1982
09/16/1982WO1982003150A1 Low ripple regulated x-ray tube power supply filament transformer
08/1982
08/10/1982US4344126 Low ripple D.C. power supply
07/1982
07/13/1982US4339792 Voltage regulator using saturable transformer
07/06/1982US4338657 High-voltage transformer-rectifier device
06/1982
06/22/1982CA1126326A1 Electron ballast apparatus for gaseous discharge lamps
05/1982
05/11/1982US4329674 High voltage transformer for AC-DC converter
04/1982
04/28/1982EP0050432A1 Transformer
04/27/1982CA1122665A1 Ring transformer for resistance butt welders
04/20/1982US4326181 High voltage winding for dry type transformer
04/14/1982EP0049608A1 Method of heating
03/1982
03/09/1982US4319152 Laminated winding for electric machines
02/1982
02/23/1982US4317040 Low ripple regulated X-ray tube power supply filament transformer
02/17/1982EP0045739A1 A device for indicating an alternating current in a conductor
12/1981
12/29/1981US4308495 Transformer for voltage regulators
11/1981
11/26/1981WO1981003408A1 Pulse transformer with shock excitation
11/24/1981CA1113161A1 High voltage winding for dry type transformer
10/1981
10/29/1981WO1981003093A1 High-voltage rectifier
10/27/1981US4297665 Doughnut-type transformer for resistance butt welding
08/1981
08/20/1981WO1981002363A1 A device for indicating an alternating current in a conductor
07/1981
07/28/1981US4281306 Electric bus bar assembly for polyphase distribution transformers
07/07/1981CA1104672A1 Furnace transformer having a low-voltage internally- connected delta winding
05/1981
05/05/1981CA1100585A1 Polyphase transformer of high mechanical resistance
03/1981
03/10/1981US4255735 Precision injection-molded coil form
02/1981
02/03/1981US4249153 Ring transformer for resistance butt welders
11/1980
11/25/1980US4236134 Multiphase transformer for power transmission in a supply system
11/18/1980US4234862 Robust polyphase transformer
09/1980
09/09/1980US4222004 Inductive transformer-type storage device
07/1980
07/08/1980CA1081104A1 Flux concentrator for electromagnetic pulling
07/01/1980US4210858 High frequency high voltage power supply
04/1980
04/15/1980CA1075783A1 Air choke coil with conductor cross-over structure
04/03/1980WO1980000636A1 High-voltage transformer-rectifier
03/1980
03/18/1980CA1073978A1 Air-cooled high-frequency welding transformer
11/1979
11/13/1979US4174509 Furnace transformer having a low-voltage internally-connected delta winding
10/1979
10/23/1979US4172215 Transformer coupling circuit providing for cancellation of D.C. fluxes
10/23/1979CA1065028A1 Air core reactor
10/09/1979CA1064119A1 Transformer
10/02/1979US4169351 Electrothermal thruster
09/1979
09/04/1979CA1061868A1 Induction heating apparatus using a pair of inversely parallel connected gate-controlled switching devices
08/1979
08/21/1979CA1060963A1 Saturated reactor arrangements
07/1979
07/31/1979US4163189 Transformer with a ferromagnetic core for d-c and a-c signals
06/1979
06/12/1979US4158156 Electron ballast apparatus for gaseous discharge lamps
06/12/1979US4158123 Series reactor
05/1979
05/29/1979US4156897 Apparatus for supplying direct current from a three-phase alternating-current source
05/22/1979US4156222 Transformer with divided primary
05/22/1979US4156173 Input impedance matching of a bipolar transistor employing a coaxial transformer
04/1979
04/17/1979CA1052875A1 Series reactor
04/03/1979CA1051985A1 High-voltage transformer comprising a foil winding
03/1979
03/06/1979US4143272 Power supply for electron beam guns
01/1979
01/16/1979CA1046600A1 Series/parallel connected single phase power transformer
01/09/1979US4134091 Low cost, high efficiency radio frequency transformer
09/1978
09/26/1978US4116031 Flux concentrator for electromagnetic pulling
09/05/1978US4112403 Saturated reactor arrangements
07/1978
07/04/1978US4099066 Pulse generating system with high energy electrical pulse transformer and method of generating pulses
04/1978
04/25/1978US4086552 High-voltage transformer comprising a foil winding
04/25/1978US4085603 Method of making V-shaped magnetic circuit elements
04/04/1978US4082984 Electric flash device with printed coil transformer
03/1978
03/14/1978US4079295 Power supply arrangement with minimum interaction between plural loads
02/1978
02/14/1978US4074101 Induction heating apparatus using a pair of inversely parallel connected gate-controlled switching devices
12/1977
12/20/1977US4064473 Transformer with windings in helical slots of core
09/1977
09/13/1977US4048604 Magnetic core
09/06/1977US4047139 Transformers of large capacity for ultra-high voltages
07/1977
07/12/1977US4035108 Axial flow pump for a pivotal rotor
06/1977
06/28/1977US4032837 Current transformer
05/1977
05/17/1977US4024370 Toroidal resistance welding transformer
04/1977
04/26/1977US4020438 Autotransformer with series and tertiary windings having same polarity impedance
01/1977
01/18/1977US4004251 Inverter transformer
01/11/1977US4002936 Electric submersible pump
01/11/1977US4002920 Underground electrical reticulation systems and transformers therefor
11/1976
11/09/1976US3991394 Helical inductor for power lines and the like
10/1976
10/05/1976US3984756 Power source for supplying stabilized current to electrical installations
10/05/1976US3984654 Arc-welding power source
09/1976
09/28/1976US3983454 Distribution transformer secondary circuit breaker
07/1976
07/20/1976US3970884 Portable X-ray device
06/1976
06/08/1976US3962622 High-voltage generator for an X-ray diagnostic apparatus
04/1976
04/06/1976US3949337 Self-induction device for generating harmonics
03/1976
03/23/1976US3946349 High-power, low-loss high-frequency electrical coil
03/16/1976US3944937 Broad-band signal transmitting device using transformer
02/1976
02/17/1976US3939362 Power pack with switch for plural primary-secondary connections
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