High-voltage generator and x-ray system
US-2025220798-A1 · Jul 3, 2025 · US
for polyphase AC
for polyphase AC · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H01F38/38 |
| Official title | for polyphase AC |
| Display label | for polyphase AC |
| Total patents | 34 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2016 | 2 |
| 2017 | 3 |
| 2018 | 1 |
| 2019 | 5 |
| 2020 | 5 |
| 2021 | 5 |
| 2022 | 3 |
| 2023 | 5 |
| 2025 | 4 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Inductive power transfer
US-2025202281-A1 · Jun 19, 2025 · US
Inductive power transfer
US-12255466-B2 · Mar 18, 2025 · US
Magnetic shielding system for a differential current transformer in a circuit breaker to provide shielding at multiple locations
US-2025079071-A1 · Mar 6, 2025 · US
Multifunction single core sensor for ground fault application
US-11799279-B2 · Oct 24, 2023 · US
Inductive power transfer
US-2023253828-A1 · Aug 10, 2023 · US
Inductive power transfer
US-11631995-B2 · Apr 18, 2023 · US
Power connector with integrated power monitoring
US-11626698-B2 · Apr 11, 2023 · US
Multifunction single core sensor for ground fault application
US-2023017320-A1 · Jan 19, 2023 · US
Predictive synchronous rectifier sensing and control
US-11437917-B2 · Sep 6, 2022 · US
Electric current transformer and current measurement unit
US-11322297-B2 · May 3, 2022 · US
Inductive power transfer
US-2022069624-A1 · Mar 3, 2022 · US
Inductive power transfer
US-11177694-B2 · Nov 16, 2021 · US
Multi-phase shift transformer based ac-dc converter
US-2021234469-A1 · Jul 29, 2021 · US
Multi-phase shift transformer based AC-DC converter
US-10978963-B2 · Apr 13, 2021 · US
Power connector with integrated power monitoring
US-2021104846-A1 · Apr 8, 2021 · US
Predictive synchronous rectifier sensing and control
US-2021028712-A1 · Jan 28, 2021 · US
Power connector with integrated power monitoring
US-10873163-B2 · Dec 22, 2020 · US
Device for measuring electric currents
US-10823763-B2 · Nov 3, 2020 · US
Inductive power transfer
US-2020287415-A1 · Sep 10, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H01F38/38?
- CPC H01F38/38 is the Cooperative Patent Classification code for “for polyphase AC.”
- How many patents are filed under CPC H01F38/38 (for polyphase AC)?
- Our database includes 34 publications tagged with this CPC code.
- Is patent activity under CPC H01F38/38 growing?
- Publication counts under this code: 5 in 2023 vs 4 in 2025 (latest complete years).