Superconducting tunable inductance
US-2026074102-A1 · Mar 12, 2026 · US
Inductances without magnetic core
Inductances without magnetic core · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H01F21/005 |
| Official title | {Inductances without magnetic core} |
| Display label | Inductances without magnetic core |
| Total patents | 30 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2016 | 5 |
| 2017 | 2 |
| 2018 | 2 |
| 2019 | 3 |
| 2020 | 5 |
| 2021 | 3 |
| 2022 | 3 |
| 2023 | 1 |
| 2024 | 3 |
| 2025 | 1 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Variable inductor and inductor module
US-2025087401-A1 · Mar 13, 2025 · US
Radiating element and associated antenna and manufacturing method
US-12021320-B2 · Jun 25, 2024 · US
Inductor device that can resist external interference and adjust inductance value and quality factor of inductor
US-11990269-B2 · May 21, 2024 · US
Thin film inductor element and thin film variable inductor element
US-2024145147-A1 · May 2, 2024 · US
Inductor device that can resist external interference and adjust inductance value and quality factor of inductor
US-2023049051-A1 · Feb 16, 2023 · US
Radiating element and associated antenna and manufacturing method
US-2022407234-A1 · Dec 22, 2022 · US
Coil former, inductive component and method for adjusting an inductance
US-2022256661-A1 · Aug 11, 2022 · US
Low inter-winding capacitance coil form
US-11217377-B2 · Jan 4, 2022 · US
Superconducting tunable inductance
US-2021375516-A1 · Dec 2, 2021 · US
Inductor trimming using sacrificial magnetically coupled loops
US-2021233708-A1 · Jul 29, 2021 · US
Integrated circuit comprising a variable inductor
US-11017940-B2 · May 25, 2021 · US
CMOS Guanella balun
US-10778176-B2 · Sep 15, 2020 · US
Switch-type phase shifter
US-10734972-B1 · Aug 4, 2020 · US
Plasma processing apparatus
US-10679867-B2 · Jun 9, 2020 · US
Cmos guanella balun
US-2020177151-A1 · Jun 4, 2020 · US
Coin detection antenna and coin processing device
US-10593141-B2 · Mar 17, 2020 · US
Integrated circuit comprising a variable inductor
US-2019371518-A1 · Dec 5, 2019 · US
Coin detection antenna and coin processing device
US-2019164371-A1 · May 30, 2019 · US
Low-frequency sound source for underwater sound propagation research and calibration
US-2019060953-A1 · Feb 28, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H01F21/005?
- CPC H01F21/005 is the Cooperative Patent Classification code for “Inductances without magnetic core.”
- How many patents are filed under CPC H01F21/005 (Inductances without magnetic core)?
- Our database includes 30 publications tagged with this CPC code.
- Is patent activity under CPC H01F21/005 growing?
- Publication counts under this code: 3 in 2024 vs 1 in 2025 (latest complete years).