Resonant Inductive Charging Patents: Leaders & Filing Trends 2026
A data-backed view of resonant inductive charging and wireless power transfer patents: who is filing, where filings concentrate by IPC class, and where white space remains.
Filing growth = 2021 (45 records) → 2024 (42); 2024 is the last year we treat as complete. Top-5 share = the 5 largest assignees ÷ all 793 records in scope (CR5), not the ranked leaders only.
What resonant inductive charging patents actually cover
Resonant inductive charging sits at the intersection of power electronics and short-range wireless energy transfer: coils tuned to resonate at a common frequency, driver and rectifier circuits that shape the power path, and control logic that manages efficiency as coupling distance and load change. The 793 records in scope span 2015 through the 2026 cut-off and cluster heavily around power-supply and grid-interface claims, with electric-vehicle propulsion and magnetics as the next-heaviest layers. Publication lags filing by roughly eighteen months, so the most recent filing years understate real activity.
The assignee base is broad rather than dominated by one player: the leader holds 29 records, and even the tenth-ranked entity holds only 12. That pattern points to a technology where core resonant-tank and coil-topology claims are contested across many mid-size filers rather than fenced off by a handful of incumbents.
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Filing trend and technology composition
Two views of the same 793-record dataset: how filing volume has moved year over year, and how records distribute across IPC subclasses. Because a single record can carry several IPC codes, the class shares below add up to more than 100%.
Filing trend, 2017–2026
Annual filings rose from 65 in 2017 to a peak of 66 in 2020, then eased to 21 by 2026 — though the last one to two years are still being backfilled as publications catch up with filing dates. The clearer signal is the 2021-to-2024 window, where complete-year volumes moved from 45 to 42, a 7% decline over three years rather than a collapse.
Publication lags filing by roughly 18 months, so 2025 onwards are still filling in. Growth rates on this page therefore end at 2024; running them to the last bar would understate the field.
Technology composition by IPC subclass
H02J (power supply and grid systems) anchors 73.4% of the 793 records, confirming that most filings treat resonant inductive charging primarily as a power-delivery problem. B60L (electric vehicle propulsion, 19.3%) and H01F (magnetics and transformers, 17.8%) are the next-largest layers, followed by H04B transmission claims at 14.6%. Medical (A61N, 6.2%), power conversion (H02M, 5.4%), wireless networking (H04W, 4.5%) and consumer devices such as A24F (3.9%) show that the core technology now reaches well beyond EV and consumer-electronics charging pads.
Shares are the percentage of the 793 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Wireless Power Transfer: Resonant Inductive Charging Patent Landscape with Eureka
This page is one run against one query. Ask Eureka your own question about wireless power transfer: resonant inductive charging patent landscape and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative filing and most-cited prior art
Bridge Inverters for Wireless Charging (US20240291395A1, Molex, LLC, 2024-08-29)
The filing discloses a bridge inverter circuit for wireless charging built from a single bridge driver, two transistors, and a resonant tank coupled to two power inductors positioned ahead of the inverter stage. The claimed structure trims the driver and transistor count relative to conventional bridge topologies while keeping the resonant tank in the power path.Abstract condensed from the original filing for length.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20100201313A1 | Increasing efficiency of wireless power transfer | 515 |
| 2 | US8140168B2 | External power source for an implantable medical device having an adjustable carrier frequency and system and… | 424 |
| 3 | US20110074342A1 | Wireless electricity for electronic devices | 386 |
| 4 | US20130088192A1 | Wireless charging and communication with power source devices and power charge devices in a communication sys… | 367 |
| 5 | US20130285606A1 | System for transferring power inductively to items within a container | 354 |
| 6 | US20050075697A1 | External power source for an implantable medical device having an adjustable carrier frequency and system and… | 304 |
| 7 | US20040267501A1 | Sensor apparatus management methods and apparatus | 272 |
| 8 | US8643326B2 | Tunable wireless energy transfer systems | 270 |
| 9 | US20110193416A1 | Tunable wireless energy transfer systems | 262 |
| 10 | US20100201513A1 | Efficiency indicator for increasing efficiency of wireless power transfer | 261 |
Citation counts favour older records simply because they have had longer to accumulate citations inside this corpus; read them as a signal of influence on the field, not of current commercial relevance.
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Browse MCP servers →What the numbers mean for filing strategy
Four read-outs from the dataset that matter more for a filing or freedom-to-operate decision than the raw counts alone.
No single company controls the core
The leader holds 29 records out of 793, and the top five together hold only 12.5% of all records in scope. That is a fragmented field: useful for new entrants because core resonant-coupling claims are not locked up by one incumbent, but it also means freedom-to-operate work has to check a long list of mid-size holders rather than two or three majors.
Cooling from a 2020 peak, not disappearing
Filings peaked at 66 in 2020 and complete-year data shows a 7% decline from 45 in 2021 to 42 in 2024. That is a mature but still-active field rather than one in decline; the apparent drop-off after 2024 is a publication-lag artefact, not a real slowdown.
Power delivery is the busiest claim layer
Nearly three-quarters of all 793 records touch H02J power-supply and grid-system claims, making that layer the densest prior-art zone. Adjacent layers — H04W wireless networking at 4.5% and A24F consumer devices at 3.9% — carry far fewer records, suggesting more room to differentiate away from the power-delivery core.
Filing is US-centred with a strong PCT tail
The United States receiving office accounts for 339 records, well ahead of Europe (130) and WIPO/PCT filings (88). India's 83 records signal it as an emerging filing venue for this technology alongside the traditional US–Europe axis.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to wireless power transfer: resonant inductive charging patent landscape, with the prior art for and against each one.
Where to take this analysis
The dataset points to specific next questions for teams deciding where to file or where to challenge existing claims.
Map freedom-to-operate against the fragmented leader group
With no single assignee holding more than a small share of records, a freedom-to-operate review needs to cover a wider set of mid-size holders rather than assuming two or three majors define the risk.
Explore assignees in EurekaTest claim language against the H02J-heavy core
Power-supply and grid-interface claims dominate the corpus; drafting that leans on control logic, thermal management or communication-layer novelty may face a thinner prior-art field.
Run a claim search in EurekaCommon questions on resonant inductive charging patents
The dataset ranks 100 assignees by patent family count, and the field is fragmented rather than dominated by one company. The leader holds 29 of the 793 records in scope, and the top five combined hold only 12.5% of all records. That means due-diligence and freedom-to-operate work needs to check a broad set of mid-size filers rather than a small handful of majors.
Filing peaked in 2020 at 66 records and complete-year data through 2024 shows a modest 7% decline, from 45 filings in 2021 to 42 in 2024. Years after 2024 look lower only because publication lags filing by roughly 18 months, so those figures are still filling in. Read the trend as a mature, steady field rather than one in retreat.
Power-supply and grid-interface claims under IPC class H02J appear in 73.4% of the 793 records, making it by far the densest claim area. Electric-vehicle propulsion (B60L, 19.3%) and magnetics and transformer design (H01F, 17.8%) are the next-largest layers. Medical electrotherapy (A61N) and consumer devices such as smokers' requisites (A24F) show the technology has spread well beyond EV and consumer charging pads.
The United States receiving office leads with 339 of the records in scope, followed by the European Patent Office with 130 and WIPO/PCT filings with 88. India, with 83 records, and Germany and Canada with smaller counts round out the main filing venues. This points to the US and Europe as the primary markets for enforcement and clearance work, with India worth watching as filing activity there grows.
The most-cited records in this corpus, several with citation counts in the hundreds, tend to be older foundational filings on core wireless power transfer mechanisms rather than recent innovations. High citation counts reflect years of accumulated influence inside a searched corpus, not current commercial importance. Use them to understand which coupling and power-transfer concepts other filers have built on, not as a guide to what is newest or most valuable today.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.