Magnetic component
US-2026031270-A1 · Jan 29, 2026 · US
for current transformers
for current transformers · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H01F27/427 |
| Official title | {for current transformers} |
| Display label | for current transformers |
| Total patents | 60 |
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 | 3 |
| 2016 | 2 |
| 2017 | 3 |
| 2018 | 3 |
| 2019 | 8 |
| 2020 | 8 |
| 2021 | 9 |
| 2022 | 7 |
| 2023 | 5 |
| 2024 | 9 |
| 2025 | 1 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Circuit breaker device with primary winding turns in opposing directions
US-12531185-B2 · Jan 20, 2026 · US
Active current compensation device capable of detecting malfunction
US-2025046514-A1 · Feb 6, 2025 · US
Active current compensation device capable of detecting malfunction
US-12159742-B2 · Dec 3, 2024 · US
Circuit breaker device with primary winding turns in opposing directions
US-2024312702-A1 · Sep 19, 2024 · US
Energy management system
US-2024283347-A1 · Aug 22, 2024 · US
Current transformer assemblies
US-2024222003-A1 · Jul 4, 2024 · US
Active current compensation device capable of detecting malfunction
US-2024203641-A1 · Jun 20, 2024 · US
Device and method for harvesting energy from a power line magnetic field
US-11989044-B2 · May 21, 2024 · US
Bus bar for minimizing AC loss in transformer and method of designing the same
US-11990270-B2 · May 21, 2024 · US
Smart current transformer system
US-11953576-B2 · Apr 9, 2024 · US
Active current compensation device capable of detecting malfunction
US-11908614-B2 · Feb 20, 2024 · US
Transformer arrangement, circuit arrangement and method for operating a transformer arrangement
US-11848150-B2 · Dec 19, 2023 · US
Current transformer of air circuit breaker
US-11810709-B2 · Nov 7, 2023 · US
Device and method for harvesting energy from a power line magnetic field
US-2023350440-A1 · Nov 2, 2023 · US
Current dependent inductivity
US-11763983-B2 · Sep 19, 2023 · US
Device and method for harvesting energy from a power line magnetic field
US-11709511-B2 · Jul 25, 2023 · US
Power supply system, control device, and method for measuring reactor current
US-11444536-B2 · Sep 13, 2022 · US
Current sensing device
US-11385265-B2 · Jul 12, 2022 · US
Active current compensation device capable of detecting malfunction
US-2022208443-A1 · Jun 30, 2022 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H01F27/427?
- CPC H01F27/427 is the Cooperative Patent Classification code for “for current transformers.”
- How many patents are filed under CPC H01F27/427 (for current transformers)?
- Our database includes 60 publications tagged with this CPC code.
- Is patent activity under CPC H01F27/427 growing?
- Publication counts under this code: 9 in 2024 vs 1 in 2025 (latest complete years).