| Patents for H01F 21 - Variable inductances or transformers of the signal type (1,432) |
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| 06/20/1995 | US5426409 Current controlled variable inductor |
| 06/13/1995 | US5424691 Apparatus and method for electronically controlled admittance matching network |
| 05/24/1995 | EP0654802A1 Variable inductance element |
| 05/04/1995 | DE4336483A1 Resonant electric circuit and method for tuning the resonant circuit |
| 04/19/1995 | EP0649152A2 Transformer integrable with a semiconductor integrated circuit and method for producing thereof |
| 03/15/1995 | EP0643404A2 Inductive structures for semiconductor integrated circuits |
| 03/15/1995 | EP0643403A2 Inductive structures for semiconductor integrated circuits |
| 03/15/1995 | EP0643402A2 Inductive structures for semiconductor integrated circuits |
| 02/21/1995 | US5392018 Electronically tuned matching networks using adjustable inductance elements and resonant tank circuits |
| 01/17/1995 | US5382937 Coil device |
| 11/22/1994 | US5367256 For sensing a rotational position of a shaft |
| 10/25/1994 | US5359315 Method of forming a three-layer structural spiral inductor |
| 10/11/1994 | US5355275 Current limiting device for electromagnetic coil employing gap containing superconductive shield |
| 09/13/1994 | US5347255 Variable inductance coil device |
| 09/06/1994 | US5345209 Adjustment system for a coil device |
| 08/23/1994 | US5341083 Contactless battery charging system |
| 07/13/1994 | CN2171905Y Multifunction welding repairing machine for vehicle |
| 06/15/1994 | EP0601919A1 Blocking device for windings of air core inductance |
| 05/18/1994 | EP0597497A1 Electronically tuned matching networks using adjustable inductance elements and resonant tank circuits |
| 04/28/1994 | WO1994009544A1 Contactless battery charging system |
| 04/28/1994 | CA2147259A1 Contactless battery charging system |
| 04/19/1994 | CA1328683C Deactivatable frequency-dividing-transponder tag |
| 04/13/1994 | CN2161975Y Variometer |
| 11/24/1993 | EP0570666A1 Variable inductance coil device |
| 10/26/1993 | US5256999 Thread type magnetic core structure |
| 09/22/1993 | CN1076545A High stability multi-nominal value standard inducer |
| 09/16/1993 | DE4206816A1 Balancing screw for inductive components - made as unit of ferrite body and plastic screw parts in recesses around body circumference. |
| 03/17/1993 | EP0532360A1 Transformer with controlled interwinding coupling and controlled leakage inductances and circuit using such transformer |
| 12/29/1992 | US5175526 Inductance device, particularly for short waves |
| 10/06/1992 | US5153547 High frequency coil |
| 09/01/1992 | US5144208 Device for adjusting a nominal value of the dimension of an actuator, the longitudinal dimension of which can be changed by applying an external electromagnetic or electrostatic field |
| 07/09/1992 | DE4143120A1 Tunable electric coil e.g. line resonator, filter - comprises resonant LC circuit with electronically variable inductor |
| 07/01/1992 | EP0492884A1 Electromagnetic device |
| 06/03/1992 | CN1061677A Inductance device, particularly for short waves |
| 05/27/1992 | EP0487388A1 Inductor, particularly for short waves |
| 05/24/1992 | CA2055658A1 Inductance device, particularly for short waves |
| 03/10/1992 | US5095357 Inductive structures for semiconductor integrated circuits |
| 01/09/1992 | DE4120097A1 HF coil assembly with thin walled core - having recess to prevent fracture by force applied by burr formed on cover during mfr. |
| 01/09/1992 | DE4020305A1 Coil for surface mounting - has former that responds to heating to adjust shape and vary inductance |
| 11/06/1991 | CN1014660B Amplitude coil for final cascade of line scanning of television set |
| 10/29/1991 | US5061896 Variable transformer to detect linear displacement with constant output amplitude |
| 10/15/1991 | US5057809 Variable inductance RF coil assembly |
| 09/24/1991 | US5051710 Variable Zo transmission line transformer |
| 08/28/1991 | EP0443173A1 Wideband tunable monolithic inductor |
| 07/17/1991 | CN2081173U Automatic electronic contactless switch for single-phase motor |
| 06/29/1991 | CA2028201A1 Automated adjustment of air-core coil inductance |
| 06/27/1991 | DE3942509A1 HF circuit with tunable printed coil - having inductance varied by moving relative position of ferrite element i.e. by distance or amt. of coverage |
| 06/04/1991 | US5021758 Circuit arrangement comprising MESFET switched spiral inductor |
| 04/17/1991 | EP0422609A1 Linearizing coil for linearizing the line current of image layer devices |
| 03/27/1991 | EP0215840B1 Inductance coil sensor |
| 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 |
| 02/20/1991 | EP0413348A2 Semiconductor integrated circuit |
| 02/14/1991 | DE3926231A1 Small, tunable inductance for HF circuitry - has parallel wound turns of two coils with identical dia. |
| 01/22/1991 | US4987390 Superconducting reversible variable inductor |
| 01/02/1991 | EP0405764A1 Conversion of bias strip in a frequency-dividing transponder tag into a tripole bar magnet to deactivate the tag |
| 12/31/1990 | CA2018267A1 Conversion of bias strip in a frequency-dividing-transponder tag into a tripole bar magnet to deactivate the tag |
| 12/25/1990 | US4980663 Automated adjustment of air-core coil inductance |
| 11/06/1990 | US4968972 Conversion of bias strip in a frequency-dividing-transponder tag into a tripole bar magnet to deactivate the tag |
| 08/14/1990 | CA1272777A1 Inductance coil sensor |
| 06/20/1990 | CN1008490B Coil with magnetisable rod core |
| 04/17/1990 | US4917317 Toroidal coil winding machine |
| 02/08/1990 | DE3826431A1 Method for narrow-tolerance inductance trimming of an electrical component which is provided with connecting pins or has no connecting pins, can be surface mounted, is inductive and has no trimming elements |
| 01/31/1990 | EP0352936A2 Deactivatable frequency-dividing-transponder tag |
| 11/23/1989 | DE3816868A1 Adjustable linearity coil for video display units |
| 11/21/1989 | US4882569 Deactivatable fequency-dividing-transponder tag |
| 03/30/1989 | DE3730303A1 Tunable helical circuit |
| 03/30/1989 | DE3730302A1 Tunable helical band-pass filter for the radio-frequency region |
| 03/29/1989 | EP0309359A1 Method for automatically controlling the self-inductance of wound elements comprising a magnetic circuit with an adjustable air gap |
| 02/21/1989 | US4806831 Coil with magnetizable rod core |
| 02/14/1989 | CA1250018A1 Controlled inductive coupling device |
| 11/17/1988 | EP0290928A1 Radiofrequency tuning inductor |
| 10/27/1988 | DE3711529A1 Circuit component module for video recorder or cordless telephone - uses terminal lead frame for securing components before embedding in resin block |
| 10/11/1988 | US4777436 Inductance coil sensor |
| 09/27/1988 | US4774490 Rotary Electric devices |
| 09/13/1988 | US4771200 Synchro generator asymmetric magnetically conductive rotor |
| 08/23/1988 | CA1241064A1 Phase lag adjustment in electric meter |
| 08/16/1988 | US4764744 Overload relay having adjustably gapped current transformers |
| 06/29/1988 | CN87212290U No-load capacitance-regulating transformer |
| 06/29/1988 | CN87205770U Multi-tap adjustable fluorescent-lamp ballast |
| 06/15/1988 | CN85205184U 多功能控制器 Multi-function controller |
| 02/16/1988 | US4725805 Electric current control type variable inductor |
| 12/16/1987 | CN87104021A Amplitude coil for final cascade of line scanning of television set |
| 12/09/1987 | EP0248329A2 Amplitude coil for the output line deflection stage of a television receiver |
| 12/03/1987 | DE3618122A1 Tunable filter coil |
| 12/02/1987 | EP0247997A1 Rotary transmitter |
| 08/11/1987 | US4685395 Controlled inductive coupling device |
| 07/14/1987 | US4680566 Coil with magnetisable rod core |
| 06/29/1987 | EP0215840A4 Inductance coil sensor. |
| 06/24/1987 | CN86100524A Contactual voltage-regulating autotransformer with multilayer winding |
| 05/07/1987 | DE3539135A1 Air-cored coil which can be trimmed |
| 04/14/1987 | US4657719 Forming thin film of resin an hardening |
| 04/07/1987 | US4656452 Transformer telephone influence tractor core shunt |
| 04/01/1987 | EP0215840A1 Inductance coil sensor. |
| 03/10/1987 | US4649459 Rotary electric devices |
| 03/10/1987 | US4649337 Phase lag adjustment in electric meter |
| 02/12/1987 | DE3527442A1 Method and device for modifying the quality factor of a coil |
| 01/22/1987 | DE3525649A1 Coil having a pin core which can be magnetized |
| 01/14/1987 | CN85106925A Coil with magnetisable rod core |
| 01/06/1987 | US4634126 Device for converting the amount of a mechanical displacement into electrical signal |
| 12/23/1986 | US4631510 Harmonically graded airgap reluctance-type rotating electric resolver |