Magnetic core of rotating transformer
US-10147539-B2 · Dec 4, 2018 · US
Rotary transformers
Rotary 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 | H01F38/18 |
| Official title | Rotary transformers |
| Display label | Rotary transformers |
| Total patents | 206 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 15 |
| 2016 | 14 |
| 2017 | 20 |
| 2018 | 17 |
| 2019 | 19 |
| 2020 | 12 |
| 2021 | 16 |
| 2022 | 20 |
| 2023 | 13 |
| 2024 | 25 |
| 2025 | 30 |
| 2026 | 5 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
System and method for non-invasive power and data transmission
US-2018340391-A1 · Nov 29, 2018 · US
Subsea contactless connector system and method with extremely high data transfer rate
US-10128909-B2 · Nov 13, 2018 · US
Magnetic core of rotating transformer
US-2018233278-A1 · Aug 16, 2018 · US
Transformer, method for manufacturing same and roller bearing with integrated transformer
US-10020111-B2 · Jul 10, 2018 · US
System and method for non-invasive power and data transmission
US-9988870-B2 · Jun 5, 2018 · US
Wireless data transfer in a deterministic rotating system
US-9968328-B2 · May 15, 2018 · US
Static vacuum shafting device for integrated rotary transformer
US-9966812-B2 · May 8, 2018 · US
Rotating body non-contact power-feeding device and torque sensor
US-9958345-B2 · May 1, 2018 · US
Rotary type magnetic coupling device
US-2018102211-A1 · Apr 12, 2018 · US
Imaging device
US-9933691-B2 · Apr 3, 2018 · US
Transformer, plasma processing apparatus, and plasma processing method
US-2017316948-A1 · Nov 2, 2017 · US
Imaging device
US-2017307964-A1 · Oct 26, 2017 · US
Rotating transformers for electrical machines
US-9793046-B2 · Oct 17, 2017 · US
Data transfer across a rotating boundary
US-2017251994-A1 · Sep 7, 2017 · US
Frequency converter
US-9755552-B2 · Sep 5, 2017 · US
Electronic control device for controlling actuators
US-9748040-B2 · Aug 29, 2017 · US
Line-frequency rotary transformer for computed tomography gantry
US-2017238405-A1 · Aug 17, 2017 · US
Rotary transformer
US-9718193-B1 · Aug 1, 2017 · US
Power delivery to a moving unit
US-9722429-B2 · Aug 1, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H01F38/18?
- CPC H01F38/18 is the Cooperative Patent Classification code for “Rotary transformers.”
- How many patents are filed under CPC H01F38/18 (Rotary transformers)?
- Our database includes 206 publications tagged with this CPC code.
- Is patent activity under CPC H01F38/18 growing?
- Publication counts under this code: 25 in 2024 vs 30 in 2025 (latest complete years).