Inductive link coil de-tuning compensation and control
US-2025309698-A1 · Oct 2, 2025 · US
by varying the permeability of the core, e.g. by varying magnetic bias
by varying the permeability of the core, e.g. by varying magnetic bias · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H01F21/08 |
| Official title | by varying the permeability of the core, e.g. by varying magnetic bias |
| Display label | by varying the permeability of the core, e.g. by varying magnetic bias |
| Total patents | 56 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 2 |
| 2016 | 7 |
| 2017 | 7 |
| 2018 | 11 |
| 2019 | 7 |
| 2020 | 3 |
| 2021 | 5 |
| 2022 | 2 |
| 2023 | 5 |
| 2024 | 4 |
| 2025 | 3 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Variable inductor and control system for the variable inductor
US-2025308767-A1 · Oct 2, 2025 · US
Multi-core segment variable inductor with different core materials, and control circuit and control method thereof
US-2025253081-A1 · Aug 7, 2025 · US
Variable inductor for plasma generator
US-12087546-B2 · Sep 10, 2024 · US
Reactor
US-12020840-B2 · Jun 25, 2024 · US
Thin film inductor element and thin film variable inductor element
US-2024145147-A1 · May 2, 2024 · US
Pulsed power circuits using hybrid non-linear magnetic materials and inductors incorporating the same
US-2024039234-A1 · Feb 1, 2024 · US
Tunable integrated voltage regulator
US-2023261570-A1 · Aug 17, 2023 · US
Chip-scale resonant gyrator for passive non-reciprocal devices
US-11695382-B2 · Jul 4, 2023 · US
Dually Electrically Tunable 3-D Compact RF Phase Shifter
US-2023207998-A1 · Jun 29, 2023 · US
Dually electrically tunable 3-D compact RF phase shifter
US-11594797-B2 · Feb 28, 2023 · US
Variable inductor for plasma generator
US-2023005719-A1 · Jan 5, 2023 · US
Inductive humidity sensor and method
US-11506630-B2 · Nov 22, 2022 · US
Magnetically actuated tunable soft electronics
US-11380469-B2 · Jul 5, 2022 · US
Variable inductor apparatuses systems and methods
US-11183322-B2 · Nov 23, 2021 · US
Reactor
US-2021272735-A1 · Sep 2, 2021 · US
Variable inductor
US-11043323-B2 · Jun 22, 2021 · US
Integrated magnetic device with variable inductance and method for making such a device
US-11037717-B2 · Jun 15, 2021 · US
Method of tuning an inductance of an inductive sensor
US-10930421-B2 · Feb 23, 2021 · US
Chip-scale resonant gyrator for passive non-reciprocal devices
US-2020350884-A1 · Nov 5, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H01F21/08?
- CPC H01F21/08 is the Cooperative Patent Classification code for “by varying the permeability of the core, e.g. by varying magnetic bias.”
- How many patents are filed under CPC H01F21/08 (by varying the permeability of the core, e.g. by varying magnetic bias)?
- Our database includes 56 publications tagged with this CPC code.
- Is patent activity under CPC H01F21/08 growing?
- Publication counts under this code: 4 in 2024 vs 3 in 2025 (latest complete years).