| Patents for H01F 21 - Variable inductances or transformers of the signal type (1,432) |
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| 08/07/1979 | CA1060110A2 Saturable reactor for pincushion distortion correction |
| 07/31/1979 | US4163189 Transformer with a ferromagnetic core for d-c and a-c signals |
| 05/22/1979 | US4156223 Positional transducer utilizing magnetic elements |
| 04/17/1979 | US4150352 Precision transducer for position measurements |
| 04/10/1979 | US4149133 Variable differential transformer apparatus |
| 03/20/1979 | CA1051104A1 Leakage reactance transformer |
| 01/09/1979 | CA1046144A1 Coil form |
| 12/12/1978 | US4129820 Variable reactance transformer |
| 12/05/1978 | US4128818 Electrical frequency responsive structure |
| 11/28/1978 | US4127836 Tunable inductor coil |
| 10/31/1978 | CA1041621A1 Microelectronic variable inductor |
| 09/26/1978 | CA1039373A1 Saturable reactor for pincushion distortion correction |
| 06/20/1978 | US4096463 Inductive transducer |
| 12/20/1977 | US4064474 Impedance ratio varying device |
| 12/13/1977 | US4063206 Tunable electrical component |
| 11/01/1977 | US4055886 Variable inductance transducer combined assembly and calibration method |
| 09/13/1977 | US4048597 Planar printed circuit board arrangement useful in the uhf portion of a television tuner |
| 07/12/1977 | US4035695 Microelectronic variable inductor |
| 07/05/1977 | US4034325 Coarse and fine adjustment warp coil |
| 06/21/1977 | US4031496 Variable inductor |
| 05/17/1977 | US4024484 Variable inductance transducer |
| 04/26/1977 | US4020412 High-efficiency transfer of magnetic energy |
| 02/22/1977 | US4009460 Inductor |
| 11/02/1976 | US3990030 Pincushion correction transformer |
| 10/19/1976 | US3987386 Tunable air coil inductor |
| 05/18/1976 | US3958203 Positional transducer utilizing magnetic elements |
| 05/18/1976 | US3958196 Coil tuning apparatus |
| 04/27/1976 | US3952603 Pushbutton system, in particular for a pushbutton operated car radio receiver |
| 03/16/1976 | US3944958 Adjusting pin for a ferro-magnetic core |
| 03/16/1976 | US3944952 Fine tuning system having a limited user adjustable tuning range |
| 02/24/1976 | US3940662 Saturable reactor for pincushion distortion correction |
| 02/17/1976 | US3939422 Dynamic antenna tuner |