Power feeding coil unit and wireless power transmission device
US-9515493-B2 · Dec 6, 2016 · US
Auxiliary core members; Auxiliary coils or windings
Auxiliary core members; Auxiliary coils or windings · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H01F27/38 |
| Official title | Auxiliary core members; Auxiliary coils or windings |
| Display label | Auxiliary core members; Auxiliary coils or windings |
| Total patents | 812 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 46 |
| 2016 | 35 |
| 2017 | 53 |
| 2018 | 97 |
| 2019 | 87 |
| 2020 | 88 |
| 2021 | 90 |
| 2022 | 92 |
| 2023 | 85 |
| 2024 | 67 |
| 2025 | 56 |
| 2026 | 16 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Field Neutralization During Inductive Charging
US-2016294216-A1 · Oct 6, 2016 · US
Transformer core flux control for power management
US-9389619-B2 · Jul 12, 2016 · US
Coil structure and wireless power transmitter using the same
US-2016189848-A1 · Jun 30, 2016 · US
Intrinsically safe transformers
US-2016189856-A1 · Jun 30, 2016 · US
System having primary conductor and movable component for inductive movement along primary conductor
US-9362045-B2 · Jun 7, 2016 · US
Apparatus and method for shielding leakage magnetic field in wireless power transmission system
US-9355773-B2 · May 31, 2016 · US
Compact magnetics assembly
US-9349523-B2 · May 24, 2016 · US
Apparatus for Reducing a Magnetic Unidirectional Flux Component in the Core of a Transformer
US-2016125999-A1 · May 5, 2016 · US
Embedded magnetic component transformer device
US-2016111197-A1 · Apr 21, 2016 · US
Multifunction magnetic device with multiple cores and coils
US-9295145-B1 · Mar 22, 2016 · US
Increasing the light-load efficiency of voltage regulators using nonlinear inductors with cores of different materials
US-9281116-B2 · Mar 8, 2016 · US
Inductance varying circuit and power supply apparatus including the same
US-2016049877-A1 · Feb 18, 2016 · US
Foreign matter detection device and method for wireless power supply device
US-2016016478-A1 · Jan 21, 2016 · US
Power supply apparatus
US-9224530-B2 · Dec 29, 2015 · US
Apparatus and Methods for Magnetic Core Inductors with Biased Permeability
US-2015371756-A1 · Dec 24, 2015 · US
Inductor structure and application thereof
US-2015364242-A1 · Dec 17, 2015 · US
Coil structure and power source device
US-2015357116-A1 · Dec 10, 2015 · US
Coil for non-contact power transmission system and non-contact power transmission system
US-2015332849-A1 · Nov 19, 2015 · US
System, method and apparatus for reducing the height of bipolar transmitters and/or receivers in electric vehicle charging
US-2015332845-A1 · Nov 19, 2015 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H01F27/38?
- CPC H01F27/38 is the Cooperative Patent Classification code for “Auxiliary core members; Auxiliary coils or windings.”
- How many patents are filed under CPC H01F27/38 (Auxiliary core members; Auxiliary coils or windings)?
- Our database includes 812 publications tagged with this CPC code.
- Is patent activity under CPC H01F27/38 growing?
- Publication counts under this code: 67 in 2024 vs 56 in 2025 (latest complete years).